Is blood that flowed for two days or less, and was copious, considered menses or istihadah, given that it did not meet the usual characteristics of a menstrual period? And is it necessary to wait for purification if it is istihadah?

The two days during which she saw blood in Ramadan are considered menstruation (hayd), and she was required to perform ghusl (ritual bath) immediately upon the cessation of the bleeding, because purity (tuhr) is identified by one of two signs: dryness (jufūf) or the white discharge (al-qaṣṣah al-bayḍā’). Any blood that reappeared after that is also menstruation, even if the period of purity between the two menstrual cycles was long, as there is no limit to it. So, if the bleeding stopped, she was obligated to perform ghusl immediately upon seeing one of the two signs of purity, even if the duration was less than her known customary period, as long as all of this occurred within a time frame that is suitable for it to be menstruation.