Tarantula

I assume asking any question in a Christian forum is futile, as the reply will always be "talk to God about it", lets face it, but I'll put it out anyway.
I've been with my girlfriend for nearly 3 years now (as of the end of the month, in fact). She wasn't christian when we first met, but I took her to an event called Soul Survivor (don't know if anybody knows about it) and gave her life to Christ. Unluckily, she didn't receive much decent teaching, and I'm not in a good place to do so, and she has slowly slipped away. She believes in God but is very, uh, liberal in what she does. I'm moving in with her at the beginning of February (I'm really not feeling very comfortable about it, but her mum is kicking her out, so we kind of have to, and I'm doing it to support her). Along with that, she works in a bookies. I'm not greatly happy with my job, because of the hours, she offered a job at where she works, but for obvious reasons (not condoning gambling in any sort), I had to turn it down a number of times. I love her, a lot I really do, but she has no problem with what she does, she feels no remorse for the sins she does, or the ones she helps cause (gambling) and she often turns to anger quite quickly. I want to help her so much, but we are slowly drifting apart, and for the first time, I've started seeing others (females obviously) as attractive, particularly a friend of mine who lives an hour away, though she knows how I feel (its a long story but my girlfriend banned me from talking to her because I got on with her better as a friend than I did with my g/f). I've never done that WHILST in a relationship before. For that reason I feel I've wronged her. But, moreover, I want her to see the errors of her ways. Either that or I need to find someone who knows what they do and when they do wrong. What should I do?
My, my. That was long.
Should I break up with her, should I pray and pray and pray until God finally goes "OK, I'll make her see the light (that is, to say, the penny has dropped, not to die aka light at the end of the tunnel)", should I talk to her about how I feel about what she does and what we intend to do. I told her initially I had no problems with us moving in together. Now, it's getting late.