The Moth Diaries -- Film Description:
"At Brangwyn, an elite girls boarding school, Rebecca (Sarah Bolger), a young girl haunted by her father's suicide, begins her junior year hoping for a fresh start. From the outset, her friendship with sunny, innocent Lucy (Sarah Gadon) is shattered by the arrival of Emessa (Lily Cole), a mysterious, dark and beautiful girl from Europe. As her friendship with Lucy slips away, Rebecca develops a crush on her handsome English professor, Mr. Davies (Scott Speedman), who is teaching a course on supernatural fiction. The supernatural elements in The Moth Diaries are rooted in the real experience of a young girl faced with her emerging sexuality and caught in a web of obsessive friendship, jealousy, and betrayal."
-- Pressman Film

Source:
"The Moth Diaries." Pressman Film. http://www.pressman.com/genre.php#themothdiaries. [official site]