Is fasting valid if menstruation occurs every day after the 'Isha prayer and stops before Fajr?

The preponderant opinion among many scholars is that the period of purity that interrupts menstruation is a valid state of purity, requiring the woman, upon observing it, to perform ghusl (ritual bath), pray, and fast. If the bleeding stops, leaving no trace in the relevant area, and she performs ghusl and prays, then her prayers are valid. If she fasts, her fasting is valid, provided it is not interrupted by the return of menstruation. However, if she sees menstrual blood during the fasting period, even a moment before sunset, she must make up that day.