Ah we had actually updated the film’s entry in the database but didn’t let y’all know about it 
Hills is best known for the hilarious Brit beatnik exploitation film, Beat Girl (1959), in which appeared as the titular character at the age of 15 alongside Ollie Reed, Christopher Lee, Shirley Anne Field, Adam Faith, Nigel Green and other well-known figures. She also appeared as the female lead in a Hammer horror, Demons of the Mind, filmed in 1971. She was better known as a singer and didn’t have much of a film career.
Her Wikipedia entry says she gave up films in 1972 and went to New York and then lists this film and The Killer Wore Gloves (1974), another Juan Bosch films, as being made by her afterwards.