In 1954, Ellis was cast as Mrs. Erlynne in Coward's musical "After the Ball", but her singing voice had deteriorated drastically, and much of her music had to be cut. Coward blamed her performance for the relative failure of the show. She appeared in the 1960 movie "The 3 Worlds of Gulliver" and made her last stage appearance in 1970, playing Mrs Warren in Shaw's "Mrs Warren's Profession" at the Yvonne Arnaud Theatre in Guildford. She appeared in 1993 in the television series "Sherlock Holmes" and again in 1994, playing Mary Maberley.