When should one perform ghusl after menstruation if it ended on the seventh day and the ghusl is to be performed on the eighth day: should it be in the middle of the night of the eighth day to perform Fajr prayer, or in the morning along with making up the prayers?

A woman experiencing istiḥāḍa (prolonged vaginal bleeding outside of menstruation) who cannot distinguish (between menstrual and non-menstrual blood) should refer to her customary period. She should perform ghusl (ritual purification bath) after its completion. She must perform wuḍūʾ (ablution) for every prayer after its time has begun. It is not permissible to delay the ghusl until the prayer time has expired. The day ends at sunset.