No one has to give up their parental rights. The parents can put her in a group home. BUT, the group home will have to be equipped to handle her and her problems. Depending on the type of group home. Chances are good her parents will have to pay for her stay there. Some of these homes can be very expensive.
Did you contact authorities when she abused and tried to kill your son ? What about when she killed the dog ?
Her parents need to go and talk to her doctor and the social worker.

