tough decision. You're stuck between a rock and a hard place. In one aspect if you act like a ragin lunatic then you are going to push her away and drive her back to her old ways.

I think what you have already done is by far the best option. If she keeps on acting up, tell her you cant live with her like that and find out what is more important to her. You or the booze?

You are going to have to find a happy medium. She is her own person and should be able to go out when she wants. You have to trust her and allow her to make mistakes on her own. You cant control that. If you see that she is slipping with getting drunk by hanging out with old drinking friends, then address it to her again.