A.P.
Tell them to try Martial Arts. In many schools they teach children deiscipline, respect and self confindence. The lack of the later can often times result in children acting out. It will allow her to also get out some of the aggression she is obviously experiencing and teach her the proper ways to express and relieve it. Suggest that they do a search of their area and go visit some schools. If they live in the southern O.P. or Olathe area tell them to check out Olathe Karate Academy. It is my school and we have dealt with many children with similar issues.
Good luck!