She appeared in the films In Which We Serve (1942) and This Happy Breed (1944), both directed by Lean and written by Noël Coward.

[3] Between films, Walsh appeared regularly in plays and farces at the Strand and Aldwych theatres, directed by Basil Dean.

She starred with Peter Coke in the 1938 thriller Death on the Table and Ralph Lynn at Aldwych in the 1940 comedy Nap Hand.

She was a semi-regular on the 1979 Anglo-Polish TV series Sherlock Holmes and Dr. Watson, and remained active in films until her retirement in 1981.

[6] Walsh's second marriage was to the Canadian psychoanalyst Elliott Jaques, and they adopted daughter Gemma in 1956.