ali777 is right about the future thinking. Don't do it. When you look at the future, and picture how it will be after she is in good shape, you get your hopes up and start to fall in love. Do not think about the future. Always judge it based on how it is right now, not what you think you will get in a few days, and especially not off the distant future, unless it is something bad. Basically, if she drinks, expect her to get liver cancer or something. Don't get attached because you think the drinking will go away. My brother is bald and fell head over heals for some fat women. It is even worse if she is pretty because she gets even more power, and probably still does not feel the same way about you.
You did not mention any manipulative stuff yet, but I can tell you from the women I've dated that they can be very calculating and tricky. Just don't fall in love and you will be fine. If you know you are as attractive as her and you have a lot in common with her and she loves sleeping with you and being with you and not comming up with excuses to avoid you, then go ahead and fall in love and don't lose her. But some will pretend, but they often don't do a good job of pretending since they always got to find an excuse to get away from you before it gets physical.