Yes, I would second hamster-bamster's recommendations. (I don't know how old the two of you are. I'm assuming you're both still minors.) The ball is in your girlfriend's court for better or worse. If she can't stand up to her dad, or doesn't want to for whatever reason, my perspective is there's not much you can do. You'll demonstrate the most maturity by simply staying on track with your current treatment & by continuing to progress.