Her last television performance was in the play "The Man in the Panama Hat", which was recorded in March 1964. Her death occurred before the intended broadcast in May 1964, and it was eventually shown posthumously on 21 September 1964.
She died from renal disease in London in 1964, aged 58, while rehearsing "The Master Builder" with Michael Redgrave and Maggie Smith as part of the new National Theatre Company. Celia Johnson replaced her.