There's a girl in my core group of closest friends from college who has a history of not eating enough and then drinking too much at social events, getting pretty drunk from this combination, then doing things that would embarrass both myself and the rest of is around her. I know many of us have has nights we drank too much, were perhaps embarrassing, etc. but in our group it is almost always her and someone else usually ends up feeling like they have to 'babysit.' Recently, she was a bm in a good friend's wedding...she didn't eat all day and them drank like a fish that night (she is also very tiny and possibly not over 100 pounds at 5'3.). By the end of the night, she couldn't walk straight and kept falling on the dance floor, so another friends husband was helping her, she then sat on his lap for about an hour while my friend got her water and food. After a few bites of food, she puked all over the linens on her table and then just sat there, too drunk to help with the cleanup as other guests stared. Those of us cleaning were frantically trying to make sure the bride and groom didn't see anything but there was such a mess they saw anyway. The next day, she acted like nothing had happened, when a friend brought it up she laughed and said she didn't really remember and weren't we all pretty drunk after all? She is a good friend and I want her at my wedding, but I don't want our families and other friends to think of our wedding and remember a wasted guest rather than the importance and fun of the day. I am planning to discuss it with her next weekend over lunch, but I have no idea what to say (or do I just invite her and take the risk or not invite her to avoid the risk and know ill be hurting her and possibly lose the friendship?). There was another wedding last year where she drank a little but not too much, acted fine and i was proud of her. Our group has tried multiple times over the years both individually and as a group to talk to get about this issue, but she's very proper and preppy and all about etiquette when not drinking and either tries to laugh it off or gets defensive and denies it happening or says she doesn't remember. But then this wedding where she acted like this was only last month, so I'm not sure what to do.