I'm so sorry to hear of what your daughter and you all are going through - it sounds tough and incredibly frustrating. I won't say you're doing anything wrong as I think we are all doing the best we can given the circumstances.
I truly feel for your daughter as I have dealt with those horrible OCD thoughts myself - I was dx PANS almost 5 yrs ago (young adult onset w severe anxiety that immediately took hold as the pureOCD subtype). It wasn't strep that triggered it for me either (my guess is it was brought on by the pneumonia I battled immediately before this illness).
While I would typically second anyone refusing psych medications, I will tell you that I would not have made it to today without their help along w the help of a great psychiatrist. I guess I'm saying please don't shut the door on the potential for her to find some relief in even just one medicine, if it gets to that point. I know there are potential risks and benefits to each approach, just please keep an open mind.
Have you heard of TRS by Coseva, before? I just placed an order this morning and would like hear from anyone who has tried this. If you haven't heard of it nor tried it give it a search. It's premise is interesting and I'm curious to see if it will help me. Btw, I am in no way advocating nor endorsing.
Wishing you and your daughter the best. Please give her extra hugs as what she needs most right now is love and acceptance, and to know those thoughts are not HER THOUGHTS, but rather manifestations of the illness itself. They do not define her. She's likely very scared inside - it's hard to understand what's going on (even for an adult, let alone a child).
(((Hugs)))