In the other semi-final bouts, S Kalaivani, Shruti Yadav, and Monika suffered identical 0-5 defeats and bowed out of the competition.
Thapa will now take on the winner of the bout between Haidara Alasaly and Minsu Choi in the quarter-finals.
Indian youth boxers Dheeraj Singh (52kg) and L P Prasad (49kg) are assured at least silver medals after entering the finals of the 33rd International Tammer Tournament, in Tampere, Finland. While Dheeraj overpowered Charlie Edwards of England in an enthralling contest, Prasad drubbed Welsh boxer Ashley Williams in another spirited performance.
The event, in Astana, Kazakhstan, is the final qualifying tournament for women boxers in the 51kg, 60kg and 75kg Olympic categories and has 12 Rio tickets on offer. Which means pugilists will have to at least make the semi-finals in the three chosen divisions to book a berth.
In the ongoing Women's World Championship, Jaismine Lamboria clinched her opening bout on Friday.
Nikhat, Lovlina on course for CWG berth
In another disappointment for India, Iran's Meysam Gheslaghi defeated Sumit Sangwan in the men's light heavyweight (81kg) division in a late Monday night bout.
Indian boxer Vikas Krishan (69kg) was out-punched 0-5 and left with a bloodied eye by local favourite Sewonrets Quincy Mensah Okazawa as he bowed out of the Tokyo Olympics on Saturday.
Sumit got off to a good start, courtesy his agility while dodging the opponent and powerful attacking technique that gave him the upper hand in the first two rounds.
Urvashi Singh beat Thailand's national champion Thanchanok Phanan in a 10-round contest to claim the WBC International Super Bantamweight title as well as the WBC Asia Silver crown.
She becomes only fifth Indian woman boxer to achieve this feat.
Threatened with disqualification for not wearing vests bearing their country's name, India's boxers at the ongoing 2016 Olympic Games in Rio de Janeiro have got their kits replaced as required by the International Boxing Association (AIBA) and will now compete without any hindrance.
Excited to witness the first professional boxing in the state, Chhattisgarh Chief Minister Bhupesh Baghel said: "Promoting sports for the current and next-generation is extremely important for the state of Chhattisgarh.
Nikhat Zareen was seen in a relaxed mood with Olympic bronze madellist Lovlina Borgohain.
Nikhat Zareen, Lovlina Borgohain, Nitu Ghanghas and Saweety Boora will look to bag gold at the Women's World Boxing Championship.
In the rematch of last year's quarter-finals, Nitu and Balkibekova went all guns blazing in the first round. However, the Kazakh was dominant and took the round 2-3.
Earlier, another debutant Rohit Mor (57kg) gave India a winning start by sailing past Ecuador's Jean Caicedo 5-0 in a confident opening-round performance on Tuesday. Next up for him is Bosnia and Herzegovina's Alen Rahimic.
Five Indian boxers, including one woman, had earlier claimed bronze medals in the youth event after losing in the semi-finals.
India's seven-member boxing contingent the first sports delegation to travel to Pakistan after last year's Mumbai terror attacks on Thursday brushed aside security concerns after arriving in Karachi for an international boxing championship starting on Friday.
Nikhat made short work of Brazil's Caroline De Almeida to notch up a dominant 5-0 win.
'I had a complex, three-stage surgery, but I am not done yet'
A look at the historic achievements by India's athletes in 2022.
In the final, Krrish and Ravi will take on Tajikistan's Anushervon Fazylov and Ilkhomjon Ergashev of Uzbekistan respectively.
Indian pugilists Lalitha Prasad Polipalli (48kg), Manish Kaushik (52kg) and Sandeep Kumar (57kg) continued their winning run, reaching the quarter-finals in the second AIBA Junior World Boxing Championships in Astana, Kazakhstan, on Monday.
India's Ashish Chaudhary was beaten 0-5 by China's Erbieke Touheta in the men's 75kg category boxing at the Tokyo Olympics, on Monday.
'It's good to be back. We start our season with a victory. It wasn't easy to fight against (Sulley). Will return to the gym in a week and will fight again in December or January'
Kom shared the certificate of recognition on Twitter
Four Indian pugilists had to be content with bronze medals after suffering defeats in the penultimate round of the ASBC Asian Confederation Youth Boxing Championship in Subic Bay, Philippines.
ASBC Asian Youth & Junior Boxing Championships: Krrish Pal registers win in 1st round
India's women boxers Nitu (48kg) and Manisha (57kg) advanced to the quarter-finals of the IBA World Championships in Istanbul, after registering contrasting victories on Saturday.
The 24-year from Assam, going by her strategy of using her long hands to reach the opponent from afar, was unable to penetrate Ngamba defence.
Nikhat Zareen and Lovlina Borgohain will look to find their footing in new weight categories with the 2024 Paris Olympic Games approaching.
Led by Olympic bronze medallist Vijender Singh, Indian pugilists stole the limelight on the ninth day of the competitions with four of them storming into the finals of their respective weight categories at the 2014 Commonwealth Games in Glasgow, on Friday.
In another men's bout, Sumit stamped his authority to get the better of Kazakhstan's Ayatulla Takiz and confirm his place in the final.
India's boxers Nitu Ghanghas won the women's 48kg Commonwealth Games title before Amit Panghal stormed to the gold medal in the men's 51kg, in Birmingham, on Sunday.
In the lightweight (57-60kg) division, Jasmine will feature straight in the quarter-finals after getting a first round bye.
Indian pugilists have a good chance of winning a medal at the Olympics, says Beijing hopeful Vijender Singh.
Seven Indians took the ring in the quarter-finals on Monday evening and four of them emerged victorious.
India had mixed fortunes in the second AIBA Junior World Boxing Championships in Astana, Kazakhstan, on Tuesday. While Naveen Kumar (50kg) advanced to the quarter-finals, Sandeep's (75kg) campaign in the tournament was cut short as he lost his opening bout.
Four Indians assured themselves of a bronze medal each after reaching semi-finals in their respective categories in the 3rd China Open boxing tournament at Guiyang.