If a woman becomes pure from menstruation at the end of the night, is it obligatory for her to fast that day?

Question : The first issue is that some women become pure at the end of the night and know that they have become pure, but they do not fast that day because they assume that if they do not perform the full ritual bath, their fast will not be valid.

Answer : That is not the case; rather, her fast is valid even if she does not perform the full ritual bath until after the dawn has appeared.