I am 17. Diagnosed cycothymic (a long term depression a little less severe than MDD), Bulimia, self-injury and ADD.
Started cutting when I was 13. I really think you did the right thing. My parents just blew it off as a ploy for attention and even as I begged teachers, and my parents, and counselors, and parents friends to help me I receieved almost no support. Im at college now and Im still trying to fight to get the help I need, and my parents still make it difficult... but the lonliness i felt and feel because of their distance has really made it worse. Your daughter may be mad at you now but she knows you want to help her. She knows you are scared and care and love her. And if I had my mothers love it would mean the world to me, and I think I could do anything.
Good luck I will pray for you and your daughter