What should a woman do if her menstrual period becomes longer?

Question : Regarding the increase, her custom was five days, but her menstruation came for seven days.

Answer : How long should she sit? She sits for only five days, then she performs ghusl (the full ritual bath), prays, and fasts. If the bleeding stops, she performs ghusl a second time, like a beginner. If her blood exceeds the minimum duration of menstruation, and in the second month she menstruated for seven days, she does what she did in the first month. If it becomes the third month and she menstruates for seven days, it becomes her custom, it becomes menstruation, and at that point it is obligatory for her to make up what is obligatory for a menstruating woman to make up regarding what she did after the first custom. For example, she makes up the fast if she was fasting on those two days. The obligatory fast, if she was fasting on those two days. And she makes up the tawaf (circumambulation of the Ka'bah) if she performed an obligatory tawaf on these two extra days.
Why? Because it has become clear that they are menstruation, and a menstruating woman’s fast is not valid, nor is her tawaf valid. This is based on what was mentioned previously regarding the beginner, and it has been established that the correct opinion is that the beginner sits until it becomes clear. Based on this, if the custom increases, the woman must remain without praying, without fasting, and without her husband having intercourse with her until it becomes clear. So, from the first month, how long does she sit? According to the stronger opinion, whether it is five days or seven days, my brothers, she sits for seven days from the start. That is, we do not say, "Wait until the two days repeat three times." We say, even if it increases, you sit and do not pray, because this is menstrual blood and it has not changed. Allah, Mighty and Majestic, has explained menstruation to us with a controlled description, saying: As long as this harm exists, it is menstruation. And on this basis, the stronger opinion is that what exceeds the custom is menstruation that she must sit for.