Birth control if there is danger on the mother's life

Q 3: A woman performed a tubal ligation surgery ten years ago because she used to suffer from toxemia, hypertension, and proteinuria during pregnancy in addition to being a diabetic patient. She used to experience epileptic seizures while delivering her four children. Doctors advised her not to have anymore children. She, thus, performed a tubal ligation surgery and she did not know the ruling of Shari`ah (Islamic law) on this issue at that time. Now as Allah (Exalted be He) has endowed her with guidance and knowledge of Islam, what is she supposed to do?

A: If the reality is as you mentioned, there is no blame on her for having performed a tubal ligation surgery. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.