The woman, Sakshi, attempted suicide last night by cutting her veins after killing the child with a sharp edged iron weapon, police said today.
As the couple did not have a child, Sakshi's husband Ramesh had adopted the daughter of his brother.
Around two days ago, Ramesh had allegedly attempted to rape the child and the matter was subsequently reported to police by Sakshi.
After the arrest of Ramesh, Sakhsi was scolded by her in-laws for reporting the matter to police and bringing bad name for the family.
On her way to the hospital, Sakshi told police that she was being harassed by her in-laws for taking the matter to police.
They were mounting pressure on Sakshi to withdraw the complaint when she took the extreme step.
She has been booked under section 302 of IPC (murder) and 309 of IPC (attempt to commit suicide).
