I'm going to let an alcoholic friend make her own choices at a party
Is that wise to let your wife make her choices while drunk?
It's her life, she needs to decide things for herself
It is understandable to mind your own business when you are able to.   There is also a need to protect your friend if they are in a bad situation.    Make sure to avoid a scenario where they get hurt and you could have prevented it.
Oh my gosh, things are getting worse at the party. She is drunken and she just threw up in her bed. I feel so bad. I should have gone with her.
Friends should look after one another, you would want the same. Go to her and try to help her out. In the future, let her know how reckless she can be and see if you can persuade her to stop drinking so much.