Blimey, I went to a boarding school (so lots of rules in order to manage a bunch of teenagers) and had an incredibly controlling mum, and at 17 I had far more freedom than your daughter has.
The school had set mealtimes of course, but we weren't required to turn up for them. If we weren't there, we went without, that's all. Tea was the favourite one to miss so we could go shopping after school, but everyone was hungry enough to be back for supper. In the week we could go out till something like 8pm, or 9pm on Wednesdays. At the weekend I was at home and had a curfew of midnight - if I missed dinner it would be on the kitchen side when I got home, which I always appreciated. My parents hated my boyfriend too, but wisely knew that if they limited my time with him, I'd just see him in secret.
I actually opted to go to that boarding school (at the age of 16) because of how controlling my mother was, and I never really moved back home afterwards. My brother, who had similar rules, chose a university "as far away from her as possible". Before she died, she told me how it broke her heart when effectively left home at 16. She also said that if she could live her life again, she would have focussed far less pushing us towards academic success and let us live our lives with more variety. Education and success in life isn't just about academia or grade points, your daughter needs to also learn (while making mistakes) about how to schedule her own life, look after herself in the big wide world and find the balance that's right for her. When my brother went to university and escaped the control, it was like he was off a leash and tasting freedom for the first time - not a good situation.
Incidentally, when I finally got away, my own OCD improved dramatically. I suspect it's because I finally had proper control over how I lived and the things that happened to me.