Should my relative pray after having exceeded forty days and blood, which the doctor called "corrupt," started flowing for 18 days?

If a woman sees blood after forty days, and it exceeds fifteen days, it is considered istihadah (non-menstrual vaginal bleeding), and she must follow the rulings for a woman with istihadah:

1. Returning to her usual habit: If she knows her previous habit, she performs ghusl (ritual bath) after its completion and prays.

2. Discernment: If she does not have a habit, she relies on distinguishing menstrual blood by its characteristics (its color, smell, thickness, and accompanying pain).

3. The usual habit of women: If she has neither a habit nor discernment, she observes the usual habit of women (six or seven days).

After the considered duration of menstruation has passed, she performs ghusl, prays, and fasts. She must use a protective cloth, perform wudu (ablution) for each prayer after its time has begun, and pray the obligatory and supererogatory prayers with that wudu until the prayer time expires.