Pippi, I'm sorry that happened. It's scary, I agree. My brother's daughter got so drunk at Summerfest this past summer that she was taken to the ER. I would have labeled it an isolated incident of teen experimentation too except that she had several similar drinking episodes AFTER this (not as as severe). She is off to school now and I do worry. Brother kind of blew it off, sister-in-law (they are divorced now) is concerned (alcoholic father) but feels helpless.
I understand your concerns and wish you wisdom in dealing with this!