Welcome to SR!
Your ahead of alot of us when we get to this site because you already know you can't force her to get help. You have also already recognized that you two aren't a good match- she doesn't want children, you don't have the same values, she is content drinking herself to death.
I would sit down and figure out exactly how much you would need to move and plan out how long it will take to get to that point. I would not mention it to her until you have it all figured out because she could freak and kick you out, get violent, or make your life a living hell. Once you figure out what it will take to get you out of there, you have a goal to work towards.
Focus on your needs. She is a grown woman and knows what she is doing and has decided she is content with that life style. All you can control is getting yourself out of that unhealthy situation. Luckily, with planning and saving money, it is not an impossible task!