All praise be to Allah Alone, and peace and blessings be upon His Messenger, and his family and Companions.
The bleeding that continues for such a long period of time is not considered menstruation, but is
Istihadah (abnormal vaginal bleeding outside the menstrual or post-partum period). Your wife should stop praying during the number of days every month on which she used to have her regular period, at its usual time. After the end of that period, she should take Ghusl (ritual bath) and offer Salah. She should perform Wudu’ (ablution) for each Salah. Moreover, she should use something to help stop the bleeding, according to her ability. (Part No. 5; Page No. 405) Any obligatory daily prayers she missed during days other than her period should be made up for.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.