I can't quite picture that, but... lurkette and I sat down and discussed our relationship and rationally concluded that getting engaged was the appropriate thing at that point in our lives. It was real romantic.
Good for you, standing beside her as she deals with her issues. Takes a big person to do that.
I vote you take pregnancy worries off her plate by taking a test and having done with it. You know she's worried about it too, right? Probably even more than you are. That can't be helping with her therapy.