I think an apology card may be a good idea.
I said this before in your other thread but I don't know if you read it si I will say it again.
To me it sounds like you have feelings for your friend that are deeper than just friendship feelings and you are jealous when she talks to other men and this makes you angry and you take your anger out on her.
If this is a possibility you should consider trying to clarify your feelings toward her and see where you want to go from there.
It is possible that she is worrying about the same thing.
You are right it isn't always about the drinking.
If you are feeling jealous it is a good idea to not be drinking around her since the drinking will most definitely bring out your anger and frustration in these situations so it is the only way you can be sure it will not happen again.
Good luck.