Hi @JIMMYB and welcome to the forums
I can hear how difficult it is to watch your daughter go through this and see her be unhappy.
It can also be frustrating when your loved one doesn't seem to be listening to the advice of their treating team. I wonder if you've been able to ask your daughter why she's not willing to accept the decisions of the doctors she's seeing? Is it that she feels left out of the decisions, or that she doesn't trust her doctor? Sometimes trying to approach these conversations with real curiosity can help to prevent the other person from getting on the defensive if they can sense that you're really just trying to understand.
OCD can be mentally exhausting and consuming, it can take time to find the treatment that works best for each individual, and even with the right treatment it can take time to make progress, that's not to say that it can't get better though, it really can.
I'm not sure how old your daughter is or how involved you are in her treatment, but sometimes it can be really helpful to understand the treatment they are receiving to ensure you're supporting her in a way that complements her treatment.
I'll leave some information here that may be helpful, for both you and your daughter:
How to deal with OCD | Anxiety | ReachOut Australia
Helping someone who has OCD - Mind
Sometimes the best thing you can do is just be there for your loved one, and it sounds like you're doing that. I do just want to acknowledge that providing this support can be very challenging and can sometimes leave us feeling a bit helpless. It's important to look after ourselves too. Do you have any supports that you're able to lean when you begin to feel overwhelmed?