The New Daughter

Supernatural thriller/horror starring Kevin Costner. After his wife leaves him, writer John James (Costner) moves with his adolescent daughter Louisa (Ivana Baquero) and son Sam (Gattlin Griffith) to the small rural town of Mercy, South Carolina. But John's attempt to give his family a fresh start is hampered by his daughter's increasingly bizarre and difficult behaviour.

Could it in some way be connected to the strange mound of earth in the forest behind their new home?