Boundaries are all about limits... what you can or cannot tolerate.
It's not about controlling her, it's about setting your own personal limits. You wouldn't say "you have to stop being drinking"... instead you'd say "I cannot take the drinking anymore. I cannot tolerate your behavior when you're drunk. If you continue to drink to excess, I will leave the relationship." She then has the choice whether to respect your boundaries or not. It's up to you to enforce your boundaries. If you say something, mean it. If you don't, the boundary is useless.
For example, my partner has combat PTSD, and he'll get aggressive and lash out verbally at times. I do not engage, and I will not tolerate being spoken to like that. I exit the room, leave the situation, hang up the phone. I will talk to him when he settles his big ass down. That's one of my boundaries. He can rant and rave all he wants, but I'm not going to stand there and be a target. I set this boundary with him, and he respects it most of the time. When he does not, I leave. Every time he lashes out. I told him I would, and I mean it. I would have lost my mind by now if I had been standing here getting yelled at for years.