The lawyers write that Mathews is "trying to grieve for her lost daughter while still caring for her remaining daughter.
Sherin went missing from her home in Richardson on October 7 and her body was found on October 22 in a culvert in suburban Dallas by a cadaver dog after an intense search. The toddler's body was identified days later using her dental records.
She was 'interrogated for hours by several officers with no attorney present' a few days later.
Sherin, who went missing on October 7 from her suburban Dallas home, was found dead in a culvert on October 22.
Sherin, reported missing on October 7, was found dead in the culvert under a road about 1 kilometre from her home in suburban Dallas on October 22.
Mathews had previously claimed that Sherin went missing after he sent her outside their home at around 3 am on October 7 as punishment for not drinking her milk.
Sherin went missing on October 7, 2017, after her father allegedly put her outside their home at 3 am in Richardson, Texas because she would not drink her milk. Her badly decomposed body was found 15 days later in a culvert near the family's home.
The 35-year-old mother, an Indian-American registered nurse, was arrested on Thursday after her attorney took her to the Richardson police station.
Sherin was confirmed dead by US police on Tuesday after over two weeks of investigation. She was missing since October 7.