I had OCD myself from a young age and it became much worse in middle school. Apparently it is a common pattern for symptoms to worsen then. So hopefully your daughter will improve like you did, but it could be very helpful for her to have some coping skills and a trusted professional for help in case it does worsen. Because of my history, my daughter has been getting some advice from a psychologist since she was in kindergarten and developed anxiety problems. She only goes when there is a specific issue, not regularly, but I think she has learned some useful coping skills and that it is helpful.
I agree that having specific testing results with IQ and achievement isn't really necessary for her to start getting professional help. However, if she shows characteristics of giftedness, then I think it is very important to find someone who understands that. My daughter first saw a psychologist who didn't specialize in gifted kids. He was very helpful in negotiating her grade skip, but thought she would do well in any setting because of her high ability and achievement scores. Her current psychologist understands her challenges much better. For example, many people have suggested oversimplifying or even misleading her to reassure her about things but I prefer the way her current psychologist approaches it from a perspective that the unknown is more scary and misleading kids damages trust, so explanation at an appropriate level is better. I don't think only specialists in gifted kids would be able to help, and I don't think misleading information is good for anyone, but I do think you are more likely to find someone who can help if you go to someone with experience with gifted kids...
If another example is needed, I can also tell you about the psychologist in middle school who insisted I was fine because of my A average even though I was incapacitated by OCD. It was awful.
