Reform School Girl (1957)

A young man (Edward Byrnes) steals a car and ends up involved in a pedestrian fatality. The only witness is a girl he had just met (Gloria Castillo). He threatens her life if she talks, so when she refuses to tell what she knows she is sent to reform school. Also stars Ross Ford. Also with Yvette Vickers and the screen debut of Sally Kellerman (who guest-starred in the second Star Trek pilot, “Where No Man Has Gone Before.”