Advice for one afflicted with obsessive-compulsive disorder in worship

Question:
This sister, Umm Ahmad, says: Shaykh, I have a full sister who grew up in obedience to Allah since she was young, and she is now eighteen years old. However, Shaykh Salih, she has been afflicted with obsessive-compulsive disorder in all matters of ritual purity, worship, and prayer. Although she asks us to stand by her when she prays until she finishes, and when she performs ablution she asks how many times she has performed it and how many times she has performed the ablution, and she suffers in her religious and worldly affairs, what advice do you have for her?

Answer:
She is suffering from a psychological illness. She must seek treatment from psychiatrists, and she must treat it by remembering Allah, seeking refuge in Allah from the accursed Shaytan, and reciting the Qur'an frequently. There are certain surahs she should repeat and recite, and this is what removes the obsessive thoughts, by the permission of Allah. Also, she should not pay attention to the obsessive thoughts; she should reject them and proceed on her path and in her worship. You should help her with what removes the obsessive thoughts from her or alleviates them, and you will be rewarded for that. Yes.