Denise's thoughts: I would start by creating some rules more appropriate for a 12-year-old instead of allowing her to act like a 15-year-old. Letting her know that there are many other positive ways to get your attention rather then doing things that that hurt her. Do more to create a positive relationship with her, giving her the attention she needs. We have some articles on cutting and self harm from our Troubled Teens Contributing Writer, Kathy Rudlin, LCSW:
The article I recommend you start with is Why do Teens Hurt Themselves with Self-Harming Behaviors?
If you find she is cutting more than you initially thought, you will want to ask her doctor for some help and resources. I hope it helps and please let us know how it is going.
Asking our parenting community: Do you have a teen who has engaged in self-harm behaviors like cutting? How did your family handle it and where did you find help for your teen? Please share your advice and experiences in our comments area.