Stepping on the baby during the delivery and causing its death

Q: My mother (may Allah have mercy on her) ordered us before dying to ask about something that had happened to her 20 years ago. While she was delivering (Part No. 21; Page No. 407) one of her children, the midwives who assisted her let go of her and she fell on her baby who died at once. Is she to blame for its death? Does she have to manumit a bondsman, pay Diyah (blood money) or fast? If she is required to fast for a certain number of days, is it permissible for me, as her son, to fast on her behalf or pay a ransom?

A: There is nothing due on your mother, as she did not intentionally fall on the child, but fell because the midwives let go of her.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.