It sounds as if she was being very honest with you. She is having fun with alcohol. This is true for many alcoholics in the beginning of addiction. Young people who are not alcoholics would use the police/school/family incidents as a wake up call.
Alcoholism is not as fast as a decline as other drugs. But it does progress. It sounds as if you suggested an AA meeting to her, she would just laugh. Try at least a few AlAnon meetings.