What is the ruling on a woman who sees spots of blood after performing ghusl (ritual purification) following menstruation, and must she repeat the ghusl, and how is that done?

A woman who has performed ghusl after menstruation and then sees spots of blood: if these spots appear after her usual days of menstruation have passed, they are not considered menstruation, and she is not required to repeat ghusl. However, if these spots appear during her usual menstrual period, they are considered a continuation of her menstruation, and she must refrain from prayer and perform ghusl after purification.