Hello Mary Lou: Prom Night II (1987)

What it's about

Mary Lou Maloney, Hamilton High's Prom Queen of 1957, is killed during her coronation ceremony due to a prank gone wrong by her jilted boyfriend, Billy Nordham. Thirty years later, teen Vicki Carpenter is in the running for Prom Queen, but accidentally unleashes the vengeful spirit of Mary Lou, who will stop at nothing to be rightfully crowned, even if it means taking Vicki's poor body for a cruise!