Are the drops that continued for 12 days, then stopped for five days, then resumed on the 17th day of the cycle with signs of menstruation, considered menstruation that prohibits prayer?

If the menstrual period lasted 12 days, then you became pure for 5 days, and then the bleeding returned, you are considered to be in a state of istihadah (definition) (non-menstrual bleeding). This is because the total duration, including the interval, exceeds 15 days (the maximum duration of menstruation), and the interval between the two bleeding periods is less than 13 days (the minimum duration of purity). The obligations of a woman in a state of istihadah are mentioned in Fatwa (definition) no. 117185.