When I was a teen and a young adult I would cut. Cutting is a sign of much more serious problems, yet often it has nothing to do with a desire to commit suicide.
There are many resources out there that can educate you on why your daughter cuts. I found an article in Ann Landers when I was 20 years old and it had a number in it. 1-800 DON'T CUT. I called it and got information about why I was doing what I was doing. This empowered me to stop it.
I learned that previous sexual abuse in my life was a big fuel for my self injury. (self injury is a good buzzword for searches, by the way. ) I also learned there was a cycle of hurting myself on the outside so the pain on the inside made sense. As I would watch my body heal I found I would feel better on the inside for a short time. This was a cycle I followed for years, until I realized I needed to heal on the inside first, then the cutting would no longer be needed.
The hardest part of this is I found that my daughter was cutting at the age of 12. Her dad and I are divorced and she lives with him 160 miles away. Without getting into a long story, she admitted to me that she does. I told her about my experience. I asked if there had been any sexual abuse or any sexual contact and she assured me there was not. We talked about it a great deal and even though her fuel is different, the end goal is the same...healing. So, we created our own "therapy", as I cannot afford a psychiatrist. I have used a lot of links on this website and many others to learn how to give my daughter the tools needed to cope and handle life on life's terms. The first thing I had to do was become an active member on HER team, HER side, not the parental side. I had to create a camaraderie that encouraged her to listen to me as a peer, that way she did not shut me out. I have been able to maintain the status as parent in her eyes, yet she now knows I will not judge her. I will listen, explore, and try on ideas with her and we can discover together what is OK and what is not.
There is hope for you and your daughter. Maybe let her know there are others out there who cut and it doesn't make them bad. It is a coping mechanism. Love her, and as far as her mental health status, if you help her deal with the issues, I am willing to bet the other things will mellow out. They did for me.
Teri