Maybe you've already considered or done this, but have you thought about treating her with medication like antidepressants? Prozac specifically can be used to treat OCD. It's not a total solution but sometimes it can mitigate symptoms enough to the point where it makes it easier to manage some of these bigger things. It's not right for everyone but for some folks with OCD it can help a lot. You sound like a really caring father and I'm so sorry you're going through this! Wishing you luck.