Great! Now, don't fuck it up by pressuring her on the details of her (possible) vaginal orgasm. Keep yur yap shut about it. Don't clam up and act cold, just don't pester her about it. If she brings it up, tell her something like; you thought she was soooo sexy cumming like that.
Most of all, keep showing her that you love her. EVEN when there's no possibility of sex!
Be complimentary, do something sweet for no damn reason at all, don't pressure her for sex, at all. Men use sex as a way to emotionally connect with their women, which is why you're having such a hard time with the whole, "can't cum from just me" thing. Most women NEED to be emotionally invested PRIOR to sex... for a lot of women, sex is a way to show their man how much they love him, but if she doesn't feel loved outside of the bedroom... you're gonna have problems.
Also, get your gf to go to a different gyno. Not saying her current gyno is bad, but on things like this a second (or even third) opinion never hurts!
Most of all, remember, sex shouldn't be goal oriented... showing her you love her and you love having any kind of sex with her is more important than getting to the Big O.