Self-Abusive Step-Daughter

I have a self abusive step daughter she is now 12. When I met her father he had left her mother and we shortly thereafter started living together. After a year the ex signed over the kid and went to Kansas has had no contact other then 7 letters since then and that was 2 years ago. We have had this child in a diagnostic center for 90 days and a therapeutic foster home for a year. We just got her back and the same stuff is starting all over again. She refuses to be any where near a human being. The counselors say she has no values of any kind, that she is a manipulative and destructive girl who lies and steals and cannot be trusted. She has a clean organized home which she has never had before and good food which she didn't' have either and she does nothing but rebel. I cannot help this child if someone cannot tell me how. NO ONE SEEMS TO BE ABLE TO DO THAT. WHAT AM I TO DO LOCK HER UP AND THROW AWAY THE KEY. I HAVE A HARD TIME THINKING THAT IS THE RIGHT THING TO DO BUT I NEED HELP HERE. SHE has counseling 2 times a week they are trying her on EMDR in another week and still she will not yield. HOW DO I HELP HER?????

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