Is the fast of one who intended to fast while menstruating valid if her bleeding stopped before Fajr, but she did not perform ghusl until the time of Maghrib prayer?

If purity from menstruation occurs before the dawn breaks, then the fast is valid, and the absence of performing ghusl (definition) (ritual bath) after purity does not invalidate it. In this case, you are required to make up the prayers of Maghrib, Isha, Fajr, Dhuhr, and Asr. However, if purity occurs after the dawn breaks, then the fast is not valid, and you are required to make it up.