What I wouldn't have dpne during my marriage to support AH in recovery! Wow, I didn't drink for about 10 years while AH WAS actively drinking - just hoping to set a good example! Hilarious now that I know something!
So fiancée is drinking? Sounds to me like: A). She is pretty keen on drinking and/or B). She is really p**sed with you and is drinking as a passive aggressive expression of her anger towards you.
I am really happy for your 2 months sobriety. And for puzzling this out. But I can imagine your GF has more than one good reason to be upset with your behavior right now. You have no right trying to control and manipulate her. None.
Sounds like you both need a time-out from your relationship with each other. You need to think more about your own sobriety. Right now, neither party is doing the other (or themselves) any favors.
Best of luck to you. Take courage, and be kind.