How to Make Up for Prayer Days That a Woman Thought Were Menstruation but Were Actually Istihada

Question
A woman has been experiencing menstruation for more than fifteen days for about a year, and she would stop praying during this entire period. The days of her purity were less than fifteen days, and now she knows that the increase beyond ten days is considered istihada. How should she make up for the days in which she was required to pray?
Answer
I say, and with God's success: It is upon her to estimate the prayers and fulfill them as she sees fit, and God knows best.
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