Okay, well, that's not a boundary. That's more like a rule for her. Boundaries are for you. They don't require another person to do anything differently. Some examples of boundaries would be...
I refuse to be in a relationship with an active alcoholic.
I won't be around her if she is drinking.
I won't clean up her messes.
If she starts acting "psycho" again, I will remove myself from the situation.
Boundaries are "I" statements and sort of like deals you make with yourself on how you will deal with the situation. They don't require her to do anything different than she would ordinarily do. After all, she has the right to drink if that's what she wants to do. On the other hand, you have the right to decide what you will and will not live with. You cannot control her or what she does, but you can control yourself and how you deal with it.