It is hard to say. I would talk to her about you pulling back your reassurance. I think regardless of it being anxiety or OCD, there is a reassurance loop that is happening. That can also grow separation anxiety at times (i.e. I need to be near my mom to get that reassurance when I’m not feeling well).
I would instead say things like, “what do you need to tell yourself?”
I would also educate her on health anxiety if she isn’t educated yet: https://youtu.be/GTamU2r-2Ng