Islamic scholars explain, based on a hadith of the Prophet ﷺ, that a woman with istihadah should not pray during her regular menstruation days. When her menstruation days end, she must take a bath and then start praying, even if the bleeding continues. After that, she must make wudu for every prayer.

The fatwa explains that istihadah is bleeding that happens outside the time of menstruation and post childbirth bleeding. This blood is called irregular or illness blood. Because of this, the woman is treated like someone with a constant impurity.

According to Islamic scholars, before each prayer time, the mustahadah should first wash the blood, then tie a cloth or use a pad to reduce the flow of blood. After this, she should quickly make wudu and pray, so that the prayer is done with the least impurity possible. This wudu must be done after the prayer time begins. She should pray soon after purification, but delay is allowed if it is for prayer related reasons like adhan, finding the qiblah, covering the body, or waiting for congregation.

This is the Islamic ruling and fatwa based only on the given hadith and scholarly explanation.