Dead of Night (1988)

A pretty woman named Sarah has been a punching bag for her boyfriend Bobby. She flees from him to the comfort of her sister April and her boyfriend' Richard's home. She discovers a book of black magic that her sister got from a friend at a party and decides one night to use it. Unbeknownst to Sarah, she ends up conjuring an evil spirit from a mirror that possesses her and turns her into a seductress that lures men who abuse and misuse her to their deaths.