Praise be to Allaah.
This woman has to pay the diyah (blood money), because she was of sound mind. The kafaarah (expiation) is to free a slave, but if this is not possible then she has to fast two consecutive months. Mothers have to be very careful in such cases, and they have to follow the doctor’s instructions.
And Allaah knows best.
Sheikh Muhammed Salih Al-Munajjid