She was arrested on May 3 after her New Delhi-based daughter Nirupama was found dead under mysterious circumstances at her home in Koderma's Chitragupta Nagar on Apr 29.
Nirupama's boyfriend Priyabhanshu Ranjan had accused the family of the killing. Nirupama's family, in turn, charged Ranjan with rape and homicide.
Investigators are yet to find out whether it is a case of homicide or suicide.
The forensic report states Nirupama wrote the suicide note, found after her death.
The forensic report of Nirupama, who happened to be pregnant at that time, did not mention the time of her death. Her viscera and foetus were not preserved.