Nightmare at the End of the Hall (2008)

Courtney Snow, an author with writer's block, still haunted by the suicide of her best friend while they were in prep school, finds herself teaching at the very same school while trying to get back on her feet. She encounters a young student, Laurel, who seems in every way to be the reincarnation of her best friend from years ago. Laurel seems to know things about Courtney that only dead friend would have known. Is she losing her mind or is it all a cruel hoax?