What i see is possibly quite different to you (and others) i'm sure.
I see a terribly abused child abusing others to stop the hurt within and then getting put into a system when she is further abused. And it would not be the first time, systematic abuse is rife in areas of the already abused, the mentally ill, aged etc... all who are less able to take care of themselves.
Weather or not she is a sociopath/psychopath i'm not convinced.
It actually reminds me of a child in a book i read, a true story concerning a child put in a special education class who was torturing animals...and generally wild and unteachable. This child, with help, did seem to adapt (somewhat) but i suppose who really knows.