What is the ruling on the prayer and fasting of a woman whose usual menstrual period has stopped and from whom black blood has come out?

If a woman reaches the age of menopause and her bleeding stops, she is pure and may pray and fast. However, if the black discharge continues, it is menstruation, which prohibits prayer, due to the Prophet's (peace and blessings be upon him) saying: "Indeed, the blood of menstruation is black and recognizable, so if it is that, then refrain from prayer." If the blood is not black but occurs during her usual period, it is also menstrual blood.