After beginning her acting career in theatre , Mitchell progressed to films in the late 1940s .
Yvonne Mitchell ( 7 July 1915 -- 24 March 1979 ) was an English stage , television and film actress .
After beginning Yvonne Mitchell 's acting career in theatre Yvonne Mitchell Mitchell progressed to films in the late 1940s .
Yvonne Mitchell ( 7 July 1915 -- 24 March 1979 ) was an English stage , television and film actress .