I´ve been a cutter in my teens (and tweens as well) and did for two main reasons. One was unbearable emotional pain, when the inner pain was so much, that I could not tolerate it at all any more, so what I did was something like "making the pain physical", it calmed me down, and made the inner pain get better. It worked basically like a sedative for me, and is was, in fact, a way to not do anything worse.Â
At other times I had this intense feeling of having lost myself, like not being grounded to the earth below me anymore, it is difficult to explain how that feels, it´s called dissociation, and that was very frightening, like I was loosing myself and going mad. In this situations intense physical stimulation, like the pain caused by the knife was "bringing me back to earth".Â
Â
The pain does release hormones which work like sedatives.Â
I never selfharmed to gain attention, or threaten anybody or as a failed suicide attempt.Â
Actually, I am now a doctor, a pediatrician, have two kids waiting for the third. I still have the scars, and I do not cover them up, since this was such a big part of my biography, and maybe made me to the person I am now. Â I even tell people what they are from if they ask, and if I know them at least a bit. Obviously not the little patients :)Â
Â
There is a wealth of information online, http://www.selfinjury.org/indexnet.html might be a starting point for you.Â
Â
Good luck! And it is really nice to see that you actually care about that girl, that is really rare.Â
Â
Feel free to ask questions, if I can help you, I will!