Is it permissible for a woman to pray, recite the Qur'an, and fast despite the continuous heavy flow of menstrual blood after it had stopped for a few days during her usual menstrual period?

The maximum duration of menstruation is fifteen days. Any bleeding beyond that is considered lochia (istihadah), and the woman must then perform ghusl (ritual purification), pray, and fast. The return of blood after a cessation of fifteen days is considered a new menstrual period. However, if the bleeding stops after the completion of the usual period and returns before fifteen days of purity have passed, it is not considered menstruation unless it recurs three times. A menstruating woman is permitted to recite the Quran without touching the Mushaf (the physical copy of the Quran).