Hi,
I am researching information for a paper due in my college class and came across your post. I felt like I needed to respond. I understand what you are going through. I have been there. Although my daughter did not hit me, we went through some very tumultuous times with her in the home. I started to see that we were not going to get the help that we needed. I talked to a hospital that caters to children who have many different psychological disorders and debated for a while whether or not to admit my daughter. When I finally did, I found that it was the best decision I could have made for her. Not only did things improve at home when she came home, but her whole attitude and demeanor improved. Sometimes it is just a matter of the child having someone to talk to about the issues they are dealing with. The hospital evaluated my daughter and we learned that she was manic depressive and anorexic. This may be your daughter reaching out for help and sometimes as a parent the only thing we can do is find that help from an outside source. I wish you the best of luck and pray that things work out for you and your daughter.
My advice would be to seek out a local hospital that caters to people who are struggling with psychological issues and have her admitted. You will still be required to have family counseling sessions while she is there, but at least it will be in a more controlled environment. She will be angry with you at first, but when she has gone through some of the counseling and learns to control her anger, she and you will be thankful.