She was married to the playwright and screenwriter Benn Levy from July 3, 1933 until his death in 1973. As Levy was from Britain, Cummings moved there and continued acting, both in films and on the stage, in Britain. Few of her films were hits in the US, although Blithe Spirit, adapted from the Noël Coward play, was popular. Levy went on to write and direct films for Cummings, such as The Jealous God (1939); he also served in the UK Parliament from 1945-50 as the Labour MP for Eton and Slough. They had a son and a daughter.