Ms Sherin, 3, was found dead in mysterious circumstances in a culvert in Richardson, in suburban Dallas, Texas, on October 22, two weeks after her Indian-American foster parents reported her missing.
Her adoptive father, Wesley Mathews originally told police he had left Ms Sherin outside the home at 3 am to punish her for not drinking her milk. Then he changed his statement and said Ms Sherin had choked on her milk while he tried to feed her in the garage.
He also admitted the family had gone out to dinner that night and left Ms Sherin home alone.
An autopsy report released in January this year revealed that Ms Sherin died of "homicidal violence."
The couple from Kerala had adopted Ms Sherin from an orphanage in Bihar in 2016.
While Mr Wesley was indicted on charges of capital murder and tampering with evidence, his wife, Ms Sini was indicted on a charge of abandoning a child.
A Child Protective Services (CPS) report released on Tuesday detailed the agency's investigation into allegation that Sherin's adoptive parents abused her months before she died, WFAA, an ABC-affiliated television station reported.
The report detailed a CPS investigation from March 2017.
The CPS said it found "insufficient evidence to determine if the deceased child was physically abused by her mother."
"An unknown perpetrator was confirmed for the physical abuse...which may have happened prior to her adoption," the report said.
"The allegation of physical neglect of the deceased child by her parents was not confirmed," the report said.
Dr Suzanne Dakil, a pediatrician, testified during a custody hearing for Ms Sherin's sister had said that she was the one who called the CPS in March last year with concerns that Ms Sherin was being abused by her parents.
"I tried, actually, very hard to find another good explanation, and I didn't have one," the doctor said in court, noting that she concluded Ms Sherin's injuries had occurred after her time in India.
Ms Dakil's clinic in Dallas had been treating Ms Sherin for her weight problems, the Dallas Morning News reported.
Ms Sherin was been hospitalised in February 2017 after her adoptive mother "noticed swelling around [Sherin's] right shoulder," the report said.
"There were concerns that the child's injuries were not consistent with the explanation given and that the child had been physically abused," the report said.
The CPS interviewed Sherin's parents, who "denied harming the child," the report said.
Ms Sini said she had taken Ms Sherin to a park, where she fell and her mother tried to grab her arm to break the fall.
Mr Wesley told investigators that Ms Sherin slipped and fell while on monkey bars at the park, the report said.
When asked about Ms Sherin's previous arm fracture, Ms Sini told CPS officials that Ms Sherin fell while jumping on the couch with her sibling, the report said.
The CPS contacted medical officials, who "stated there were no concerns about the previous injury because the story was consistent with the child falling off the couch."
The medical officials said the fractures in Ms Sherin's shoulder injury were "questionable," the report said.
The report said "although there were no concerns regarding the child's previous injuries, the new injuries were not consistent with the explanation given."
The issue of Ms Sherin's weight was also raised in the investigation.
Both parents said Ms Sherin had health problems when they adopted her from India, including being underweight.
Doctors who had treated Ms Sherin "denied having concerns about abuse and neglect while the child was with her adoptive parents" and that Ms Sherin "was in better health and at a better weight following her adoption," the report said.
Law enforcement authorities investigated the report but did not file charges.
(This story has not been edited by NDTV staff and is auto-generated from a syndicated feed.)
Get Breaking news, live coverage, and Latest News from India and around the world on NDTV.com. Catch all the Live TV action on NDTV 24x7 and NDTV India. Like us on Facebook or follow us on Twitter and Instagram for latest news and live news updates.