She only appears in the last 15 minutes of the film. Mrs. Voorhees’ presence is, at first, rather disorienting, since we’ve seen so few adults during the course of the carnage. As she tries to comfort a distraught and very upset Alice, her almost blasé response to the concept of a killer on the loose makes her instantly suspect.
Still, we’re willing to go with this well-meaning matriarch, at least, up to a point. And then Betsy Palmer, TV star from decades past, opens up her predatory pearly whites and starts telling the story of a boy named Jason, and soon we see the light. As the mother of the drowned lad, Mrs. Voorhees means business, and in her line of work (carving up teenagers), business is booming.