OCD

Bismihi ta'āla

Indeed, you must be concerned, and if not stopped, it will consume her, and make her life miserable, and everyone around her as well. 

She must only follow her shar'i takleef. Nothing more, nothing less. Her duty is to constantly dismiss her doubts, and consider whatever she does as correct, even if other thoughts enter her mind, and even if she continues to think she did it wrong. She ignores it. 

Once she does this for a while, it will, in shaa Allah, break the cycle of her intrusive thoughts.

And Allah knows best.

Bismihi ta'ala

This is a frequent question, and I would recommend you refer back to the many answers we have given here on this platform.

This clip could alos be useful for you, in shaa Allah:

Bismihi ta'ala

Please read our previous answers to similar questions, and this clip as well would be in shaa Allah useful as well:

Bismhi ta'ala

The issue of over-analysing a specific scenario, or becoming scrupulous in matters of religion is not something new, and does unfortunately affect some people. 

If it is not tended to in its early stages, then it can only be cured by psychological help or medical treatment. 

If it is issues related to taharah/najasah, then you need to re-program yourself and corretly learn the ahkam, emphasising on the pleasure and spiritual benefit of 'ibadah, and not that it should be straining or negative. 

I would recommend watching this short presentation I gave a few years ago:

You can recite this dua:

أعوذ بالله القوي، من الشيطان الغوي، وأعوذ بمحمد الرضي من شر ما قدر وقضي، وأعوذ برب الناس من شر الجنة والناس أجمعين، وسلم، تكف مؤونة إبليس والشياطين معه ولو أنهم كلهم أبالسة مثله

Also, it is recommended to eat pomegranate, as hadiths say it removes waswasah, piece by piece, and in the morning before breakfast. 

With prayers for your success.

Bismihi ta'ala

Just because you might have some doubts, or even excessive doubts about certain things, it does not mean you have "OCD". We must remember that such problems must be diagnosed by a psychologist or a professional in that field. 

Scrupulosity starts off very innocently, due to one's concern about getting their religious acts right and valid. However, it turns in a very bad state that make one very miserable in the areas they suffer in.

Instead of feeling a sense of spiritual uplifting or inner-peace, waswasah becomes a burden and leads to hating religious practices.

Please watch this presentation:

https://www.youtube.com/watch?v=Pz2HGVepaC8&feature=youtu.be

Wassalam