Naked Vengeance (1985)

Carla Harris, a beautiful but not so successful actress from L.A., witnesses how her husband is tragically killed in an attempt to save a woman from her male attacker. She travels to her parents' home in a small town in the mountains to get some rest only to be repeatedly harassed by redneck locals and a teenager. The local sheriff refuses to help and so it all ends up in a gang rape and with Carla's parents shot dead. Carla survives and escapes from the mental hospital to seek bloody revenge.