In my opinion, The Game is just one really long LR/journal from Strauss. Still a good read and worth it. I would recommend it, but it needs to be supplemented with other things. You're going to learn a lot from it, but it's definitely no Bible, or magic book. In fact, in my opinion, books have always helped my inner game more than my outer game. Even books that have nothing but routines in them... Weird, huh?
In regards to your other question, you need to show her that you're not intimidated by this other guy being the apple of her eye. Just go in there and tell her you still want to go out and see where it leads. This sounds like a major shit test to me.

If she still insists, and says it's a definite no, then just back off, wait, and contact her again in a week or two, and see how everything has panned out. This will show her you're not desperate, have other things going on, and most obviously, that you're aware things can change and you're still interested if she is. If she still doesn't want to go with you, drop her and move on. She may even come back to you later as "that guy she had a thing with before", and you'll have changed positions. You never know!
