I'm headed to Vegas with a group of about 9 or 10 friends in September, which is just gonna be so much fun. However, a friend of mine approached me the other day saying she wants to go to, she's a peripheral part of this group of friends, she knows them all and has hung out with us a bunch of times. This friend has some issues though. She tends to drink A LOT and then get very angry and moody. She's sought out counseling for this a few times in the past, but she doesn't stick with it and not much has changed.

I'm very concerned about her coming on this trip, my group of friends doesn't want her to go because they don't want to have to deal with her behaivor, and I don't want to have to babysit her the whole time or feel responsible for brining her on the trip and ruining other people's good times.

I have no idea how to approach her about this, either telling her if she goes she's responsible for herself, or telling her she just can't come on the trip. I don't think I can say that to a friend and I don't see how to say anything like that to her with out seriously hurting her feelings and our friendship.

Does anyone have any advice??