I need help involving alcohal and a girl. please?

right now i am having a big dilema with myself. i been seeing this girl for a couple months now and everything is awesome. i am head over heals for her, and she is for me also. now she is off to college far from mine so i havent seen her for a few weeks but we talk daily. but her main home is close to mine. what is troubling me is that she drinks alot of alcohal. and i am very very un easy with that. cause i obviously want her to stay pure cause she is so stunningly beautiful and is such an amazing person. she knows how i feel about it, n she takes account on it but not entirely. im at the age where i want to have a steady long term relationship with somone i really love. and i truely feel it can be her because our chemistry is unreal and we feel right about eachother. the only problem is that i dont feel i am in any position to tell her what to do. she may do as she pleases when it involves alcohal. as much as i care about her i feel like letting her go just because of that. i am not picky at all but that just isnt something i want in a relationship. its not who i am or what im about. at the same time i dont want to lose her because she has grown in me so much that i feel like she is a part of who i am now. any advice on what i should do?? just cause she is so "amazing" and so "beautiful" shouldnt hold me back from knowing what i want right? what would you do in this position? forget about her flaw and go with it? or just let her go? better yet what is the right thing to do?? thankyou guys