Answer
Mrs. Parkington, a 1944 film, featured Agnes Moorehead in a supporting role. The film, based on the novel of the same name by Louis Bromfield, tells the story of an elderly woman (Greer Garson) who reflects on her life and the people she has known. Moorehead played the role of Susan Parkington, the protagonist's daughter-in-law, a manipulative and ambitious woman who causes conflict within the family.