Hi Sandie,
Wow, sounds like my son who was fifteen when I got him. The nice behavior lasted for exactly two weeks and then I saw the light after four months. His Dad ws diagnosed as a P(psychopath) so his problems were glaring at me. Wow, she sure sounds very manipulative for a nine year old.
My son would go around telling stories to anyone who would listen which was just about everybody. He almost landed me in jail, so he had to go. Do you think she is a P? If so, there is a book called "High Risk" which is a very good book.
Hugs,
Honeybee