Is someone who experiences discharge after Istinja' due to a pelvic muscle condition, which causes waste to exit, considered to have سلس (incontinence), and how can she perform Salah while suffering from this condition and doubting her purity?

The religion of Allah is ease, and it does not obligate a Muslim to exert themselves or be extreme after relieving themselves. What is prescribed is to wash only the visible area affected by impurity, and inserting a finger or inspecting clothes is a form of exertion that is forbidden by Islamic law.

The situation described is either a case of waswasah (obsessive whispering) or a pathological condition: 1. Waswasah: It is sufficient to perform istinja' (cleaning oneself after relieving oneself) and wudu' (ablution), then pray, and there is no obligation to inspect clothes. If something appears after the prayer, the previous prayer remains valid. 2. Pathological condition (incontinence): A piece of cloth should be placed to prevent the spread of impurity, and one should perform wudu' and pray. The emission of something does not harm the prayer. One can combine prayers, either nominally or truly, to alleviate hardship, changing the cloth and performing wudu' for each prayer or each time prayers are combined.

This condition only affects wudu' and prayer; it does not prevent the remembrance of Allah or the recitation of the Qur'an.