If a 7yr old has endured emotional abuse and intrusive examinations should they live with the perpetrator?

My eldest daughter has lived with a DHS Carer since she was 3 following my then inability to overcome my grief of her father ping 1month prior to her birth.Her fathers family and i were allowed access visits seperately.Since April 2002 i have improved beyond words and now have 2 other children who are in my full time care.In April 2003 my daughter was placed on a Permanent Care Order meaning she cannot live with us until she is of age to decide it for herself.In 2004 DHS returned the matter to court with evidence of abuse from Carer whist my daughter was in thier care.Carer took my daughter to see hypnotherapists, councellors and requested intrusive medical examinations to be performed on my daughter in order to prevent access ocuring.DHS requested my daughter be returned to my care.Unfortunately due to the length of time she spent with the Carer,it was ordered she remain with them.Whats wrong with this picture,that you can abuse someone whos lived with you for years and thats ok?