Is this the 14 year old, John? I ask because it seems to be a prime age for adolescent girls to turn to self-injury as a coping mechanism. There is an excellent support site that you can try to encourage her to visit called 'bodies under siege' here
bus. They also have forums for friends and family members who want to support their loved ones.
There have been a number of discussions here in the past on self-injury as well. Keep in mind that most people who self-injure are not trying to kill themselves, in fact, by releasing the built up stress through self-injury, they are avoiding suicidal thoughts.
I'll try to find some of the older links.