Yeah, when my wife and I were dating, she lived about 2 hours from me, and I would go down just about every weekend to see her. Her parents are divorced, and she never talks to her dad, so I got to know and talk to her mom on a fairly regular basis. But then, I'm a pretty personable guy. It's hard to hate me once you get to know me. That's not BS either. I don't have any enemys at work on in my personal life.
I know and understand that you're hurting right now. You're probably feeling really rejected and a little sore at Hannah for not defing her parents and coming out anyway. My advice, and you can take it or leave it, is to not let this get to you. If you do, it will eat away at your relationship with her. And don't mention it to her parents next time you see them, just be as friendly and personable as you can be, and God-willing, you will win them over.
I wish you luck.