Is the black blood that descended upon the girl when she was nine years old considered menstrual blood? Was she considered an adult at that time? Is she required to make up those days, or make up a full Ramadan each year for four years?

The relied-upon position in the four schools of thought (madhahib) is that the minimum age for menstruation is nine lunar years. The blood a woman sees after reaching the age of nine is considered menses if it exceeds its minimum duration (a day and a night) and does not exceed its maximum (fifteen days and nights). The rulings of menstruation apply to her, such as refraining from fasting and prayer. Her puberty is established by it, and she is required to make up for the fasts.

Therefore, the black blood the questioner saw after reaching the age of nine is menstrual blood, which establishes her puberty. She must make up for the Ramadan fasts she missed after reaching puberty. She should ascertain the number of days to ensure her obligation is fulfilled. As for the prayers she performed before performing ghusl (ritual bath), the majority of scholars hold that she must make them up, as they were invalid due to the lack of the condition of purity. Shaykh al-Islam Ibn Taymiyyah is of the view that making them up is not obligatory if the omission was due to ignorance, but the opinion of the majority is more cautious.

She should make up the missed prayers and days according to her ability and capacity, in a way that does not cause her harm in her livelihood or body. If immediate make-up would cause harm, then the immediacy of the make-up is waived.