CBT for 12 year old with OCD

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My dd (12) has been recently diagnosed with OCD by a CBT therapist that we attended privately.( public waiting list here is horrendous).
She has recommended some CBT sessions to help dd.
Has anyone had success with CBT for OCD ? If so, how long did it take ?
I'm just afraid DD's anxiety will increase before it improves with the therapy.
Never had to deal with this before , so a little overwhelmed by it all.

Yes.

CBT is great for OCD and anxiety based disorders; it'll take about 8-16 sessions

CBT is fantastic, if you’re willing to engage. I first did it as a very mentally ill 16 year old and still use the technique probably at least once a week 16 years later. What makes you think it will increase her anxiety?

Though - the CBT therapist shouldn’t really be the one diagnosing. Are they an actual psychologist?

Thanks didshereally, that doesn't sound too long. Hopefully she will benefit from it.

Thanks BuffaloCauliflower, a friend of mine said dd anxiety may increase during the sessions due to her trying to stop her rituals etc, I'm hoping this isn't the case .
The lady we are attending is a CBT therapist but has worked with CAMHs previously. I wasnt 100% sure who could diagnose OCD. What she said, is that dd is showing signs of OCD and that CBT would definitely help her.....probably not the same as a formal diagnosis.

CBT works for all kinds anxiety. It can be challenging working through the rituals and anxiety, that’s fair to say, but it’s part of the recovery process. It’s great that this has been picked up on now while she’s young and get help she needs now. CBT is a really active tool for managing anxiety that she can take with her throughout life

Thanks again BuffaloCauliflower. I suppose alarm bells rang when I asked her why she was doing her new "habits" , mainly hand gestures and facial gestures , and she said it was to stop bad things happening, like one of her family or friends getting sick.
They've become more and more frequent and more prolonged.
Thanks for the insight and I really hope she engages in the CBT. She's anxious enough for the rituals to stop, as at the moment she cant seem to stop on her own, so hopefully she will engage.
She starts secondary school in Sept, so I'd like her to be managing better, as they're quiet obvious, and I don't want anyone mocking or teasing her about it .
Thanks again .