Dead Saints (2011)

In an institution for troubled girls, Zoe, an angry delinquent, is forced to share a room with silent Jehanne, a girl who lives as a saint in a world of her own devising. Hostile at first, an uneasy truce is struck in the face of a common enemy. As their friendship grows the wall between this world and that of Jehanne's fantasies begins to thin, revealing to Zoe a beautiful escape.