I agree with vicodin. If you feel you have nothing to lose, then use her as 'batting practice.' Besides, a girl who initiates text with you is a huge IOI. I speak from experience. The more women you deal with, the more you will see a trend that majority will not initiate text. I mean just look on the forums with all the problems guys are having with dealing with phone flakes and getting responses. For a woman to initiate, it means you are on the top of her mind. Again, strong IOI and they must really like you. That will be a small percent of all the fish you round up, so appreciate what you got.
Having said that, what a waste if you just cut her off. Having a bunch of HB8+ (even as friends) always helps to maintain social proof. Remember, beautiful women attract other beautiful women. When a woman sees you with a beautiful woman, she will wonder what you are all about.
As for the vegas part, I do know a girl who is extremely hot, does not drink and is conservative when it comes to sex, and goes to Vegas once a month. Vegas is a favorite spot regardless. Something in Vegas for everyone. Every girl is different and you won't really get to know her as a person if you cut things off too quickly.
HOWEVER, her letting you finger her and then telling you she wants to wait for marriage, THAT sounds completely off. I mean...what is the point? Sounds like some major LMR due to wrong environment.