Deadly Innocents (1989)

One is young and naive. The other is dangerous. Together they'll kill you with desire.

Angela is a sensitive teenager and her fanatically religious father has forced her to dress and work like a boy in his gas station. When Beth, who has a split personality, escapes from the sanitarium, she meets Angela. Beth tempts Angela to be a real girl by wearing Angela mother's clothes. Then both become a lethal combination.