What is the ruling regarding the missed prayers that the questioner omitted, believing she was in her menstrual period, but it later became clear that it was istihadah (non-menstrual vaginal bleeding)?

If a woman sees blood after thirteen days or more from the cessation of her previous bleeding, and its duration, including any subsequent blood, yellowish discharge (ṣufrah), or brownish discharge (kudrah), does not exceed fifteen days, then all of it is considered menses (ḥayḍ). However, if she sees blood before thirteen days have passed since the cessation of her previous bleeding, or if its total duration exceeds fifteen days, then it is considered abnormal bleeding (istiḥāḍah). In this case, she should consider as menses only what corresponds to her usual habit, and what does not is not menses. It is more prudent for her to re-perform the prayers she missed during that period.