The deceased has been identified as Bhawana Yadav, they added.
Parents of the girl had registered a missing person's complaint, after she had disappeared following a scuffle between her them and their neighbourers on Thursday night, Chandan Nagar police station in-charge Pawan Mishra said.
The postmortem report revealed that the body did not bear any injury marks, Mishra said adding that they were yet to ascertain the cause of her death.