Betrayed:

For the first few years of her life, Sarah Harris was a normal, happy, popular little girl. But from the age of six she was targeted by a vicious, manipulative but invisible enemy — and her life became a living hell. Before long she was suspended from school, alienated from her friends, completely bewildered and utterly terrified. Her happy childhood had been destroyed forever. For her mother, Lyndsey, it was a life beyond her worst nightmares. Her little girl, the daughter she loved so much, seemed to have transformed overnight — into a child she hardly recognized. A child she almost feared. Suddenly, Lyndsey was fighting to keep her family together — and to save her daughter’s sanity. But then the horrific truth started to become clear. And both Lyndsey and Sarah discovered they had been the innocent victims of the most horrifying betrayal imaginable.