Sarma, who heads the Bharatiya Janata Party-led North East Development Alliance (NEDA), met Sangma at a hotel in Guwahati on Tuesday night, they said.
Her husband Raja's body has been discovered, but there is no trace of Sonam Raghuvanshi.
BJP Meghalaya in-charge Chuba Ao said the party's 'Congress mukt campaign' is valid for the state and hence the party will seek clarification from the chief minister.
The former Meghalaya chief minister, who recently switched over to the TMC along with 11 other Congress MLAs, told PTI in an interview that the political dynamics in the entire region is going to change with him quitting the grand old party.
Voting to elect 60 members of the state assembly in Meghalaya is scheduled for Monday, February 27. The results will be declared on Thursday, March 2.
A coalition government, led by National People's Party leader and outgoing chief minister Conrad Sangma, will be sworn-in on Tuesday morning in Meghalaya, while an all-party government, led by Nationalist Democratic Progressive Party (NDDP's) Neiphiu Rio will take oath later in the day in Nagaland.
A person was also arrested in connection with the blast that took place on Sunday evening at the entrance of one of the shops at Police Bazaar, he said.
After Sonam was found in Uttar Pradesh, the police officials sent her to Sadar Hospital for initial treatment. Now she is kept in the Sakhi One Stop Centre, the official said.
The sports department of Meghalaya denied permission to the Bharatiya Janata Party to host an election rally of Prime Minister Narendra Modi at the PA Sangma Stadium in Chief Minister Conrad K Sangma's home constituency of South Tura, citing construction work at the venue.
Prime Minister Narendra Modi, his cabinet colleagues Amit Shah, Nitin Gadkari, Rajnath Singh, chief ministers of Nationalist Democratic Alliance-ruled states and prominent personalities from industry and Bollywood on Thursday attended the grand swearing-in of Devendra Fadnavis as Maharashtra Chief Minister in Mumbai.
'The Meghalaya police are giving false statements about my daughter because the state government's image is getting tarnished due to Raja Raghuvanshi's murder case'
Assam Chief Minister Himanta Biswa Sarma on Tuesday said he and his Meghalaya counterpart Conrad Sangma will also visit the disputed areas later as a goodwill gesture.
The exit polls further pointed out that the northeastern state would have a hung house, with Sangma's National People's Party (NPP) emerging as the single-largest party.
They will, however, remain in the Congress, Congress Legislature Party (CLP) leader Ampareen Lyngdoh said.
Raja Raghuvanshi (29) and his wife Sonam had gone missing on May 23, hours after they checked out of a homestay at Nongriat village in Sohra area
'Someday I will summit all peaks, but right now I want to complete my BSc.'
'One of our MLA's homes has already been attacked by the mob. This legislator was beaten. This MLA belongs to the Meitei community.' 'There is a complete collapse of law and order in Manipur.'
A tourist guide on Saturday claimed that the honeymoon couple from Indore, Raja Raghuvanshi and his wife Sonam, was accompanied by three men on the day they went missing from Meghalaya's Sohra area.
Stakes are high for the Bharatiya Janata Party, as the results will signal if it has deepened its roots in Tripura, and made further inroads in Meghalaya and Nagaland, or if the Opposition has managed to dent its influence.
The chief minister of Meghalaya had met Shah late on Friday night urging the Central government to implement Inner Line Permit in the state.
Ruling parties held sway in most of the 13 states in the assembly byelection results declared on Saturday, with the Bharatiya Janata Party and its allies wresting seats in Uttar Pradesh, Bihar and Rajasthan and the Trinamool Congress sweeping West Bengal.
Debutant legislator Rekha Gupta was sworn in as Delhi chief minister along with six ministers on Thursday in a grand show of strength full of colour and spectacle to mark the Bharatiya Janata Party's return to power in the city after more than 26 years.
The juggernaut of the Bharatiya Janata Party-led National Democratic Alliance, which triumphed in three of the four east and north-eastern states that went for assembly bypolls on Saturday, was halted yet again in West Bengal where Mamata Banerjee's Trinamool Congress registered a six-on-six clean sweep.
'Discussions are on' within the saffron camp, and a final decision on whether to come out of the ruling coalition or not will be taken in one month, he claimed.
Post-poll violence that erupted in at least three assembly constituencies in Meghalaya left several people injured, while one person was found dead in a mysterious circumstance, officials said on Friday.
"I have 27 missed calls during the time I've been speaking to you! Here if you don't answer the phone, there is every chance a party member will tell you 'Because you didn't answer my phone I'm leaving your party.'" Archana Masih reports on how a graduate of the prestigious Wharton Business School fits into the unusual landscape of North-East politics.
Security personnel deployed outside the Transport Bhavan, metres away from the Parliament complex, did not allow anyone to go beyond the barricades they had put up before checking their identity cards and entry passes.
Meghalaya Chief Minister Conrad K Sangma said on Wednesday that he along with Assam CM Himanta Biswa Sarma will meet Union home minister Amit Shah to submit the recommendation of the two Northeastern states for resolving the boundary dispute in six areas.
Conrad Sangma, 35, Leader of the Opposition in the outgoing Meghalaya assembly that goes to the polls on Saturday, explains the need for a fresh approach to solve the problem of insurgency in the state, the reasons for the lack of women in state politics and the need for cultural exchanges between the North-East and the rest of India.
Dismissing his Assam counterpart's claim, Meghalaya Chief Minister Conrad K Sangma on Tuesday asserted in the assembly that Mukroh village on the disputed inter-state border, where a violent clash claimed six lives last year, is a part of the hill state.
In the morning, he offered prayers at the Dashashwamedh Ghat and the Kaal Bhairav temple in Varanasi.
Addressing a joint press conference in Guwahati, Assam Chief Minister Himanta Biswa Sarma and his Meghalaya counterpart Conrad Sangma said border committees set up earlier to hammer out solutions will submit their reports by November 30.
The governments of Assam and Meghalaya had come up with a draft resolution to resolve their border disputes in six of the 12 "areas of difference" along the 884-km boundary.
The support for P A Sangma, who is contesting the presidential election, is increasing day by day, claimed his son and Leader of Opposition in the Meghalaya Assembly Conrad K Sangma on Saturday. Conrad, an influential leader of the Nationalist Congress Party in Meghalaya, told reporters at an official meeting of the NCP, "P A Sangma's vote share is increasing and now it is at 30-32 per cent of the total votes."
The Manipur government headed by Chief Minister N Biren Singh was plunged into crisis recently after four NPP and three BJP MLAs withdrew their support from it.
The 60-member Meghalaya assembly had 30 Congress MLAs. Friday's resignation comes days after another Congress MLA, P N Syiem, resigned from the party.
Prime Minister Narendra Modi will be on a two-day visit to the North East from Tuesday, during which he will attend the oath-taking ceremonies of new governments in three states of the region.
Union Home Minister Amit Shah has cancelled all his programmes for the upcoming assembly elections in Karnataka in the wake of clashes reported in parts of Manipur, sources said.
Nagaland and Meghalaya BJP chief Temjen Imna Along and Ernest Mawrie, respectively also named party candidates approved by the party's central election committee.
The Nationalist Congress Party (NCP) general secretary and former Lok Sabha Speaker Purno A Sangma has fielded both his sons in the March 3 Meghalaya Assembly elections from two constituencies in his strong bastion in Garo Hills areas of the hill state.