Martyrs (2008)

Two horribly abused young women return to the family that hurt one of them, to find that their actions are far from over in graphic horror 

Lucy’s kept in a slaughterhouse and brutalized before managing to escape, where she’s taken to an orphanage. She befriends a girl named Maria who also suffered abuse, and when Lucie decides to find the family who tortured her, she asks Maria to accompany her. But demons also exist within Lucie, who succumbs to violence, and Maria’s drawn back to the family’s household with a suspicion that their horrifying behaviour is still ongoing.