A woman fasting in expiation for accidental killing who menstruates before finishing: does she complete or restart?

Mughirah said: I asked Ibrahim about a heavy sleeper whose child was sleeping beside her, and in the morning he was found dead (what is the ruling?). He said: It is better for her peace of mind that she pay an expiation: free a slave, or fast sixty consecutive days. I said: What if she menstruates during the fasts? He said: That is something women cannot avoid; when her menstruation ends, she should make up the fasts of those days (and not begin all the fasts again).

Al-Hasan said: If a woman kills someone by mistake, then fasts (as expiation) and menstruates, she should make up those days afterwards.

Ibn al-Musayyib said: The woman should fast, and when she menstruates, she should complete the fasts that remain.

Al-Hasan said: If a woman vows to perform i'tikaf (spiritual retreat) and then menstruates during those days, she should make up afterwards the days in which she menstruated.