A.C.
I normally would not suggest this (except her problems seems to go beyond normal teen angst), but IMO she needs to be forced into treatment. She is 14, her father can legally make her get help, and it is his responsibility to do so. This is the time in a young girls life where she typically sets out on 1 of 2 paths: self-destruction or self-discovery. Give her the tools and the healing she deserves so that she can make a life for herself later.
She will be resistant, but most people are. She is too young to be given up on or too have given up on herself. She needs in-patient help so that she can build a solid foundation for herself to live a healthy, productive life.