My Teenage Daughter is "Waging War" Against My Fiancé

I believe my daughter (who will turn 15 on March 20th) has ODD. Defiant is a word that has always described her, however, she and I have always dealt well together - until this past year. My fiancé moved in last March, and in May, she went to school drunk. So drunk in fact, that she was taken away by the police to the children's hospital for evaluation. She has continued to drink on weekends and every month or so, something occurs. It might be her being brought home by the police, or us calling the police to help as she is violent and acts possessed when she drinks. She did spend a week in the mental unit at the children's hospital. She is waging a war to get my fiancé to move out and the two of them are engaging in a war. He employs some pretty consistent methods, and we usually agree, but she has wrecked and stolen some of his things, called him everything under the sun, written notes and put them all over the house telling him to move out...you name it. Now he...