 Balfour's sound debut, "The Nipper" (1930), based on the "Squibs" character, was only moderately successful.Her popularity diminished in the 1930s, though she played a supporting role to Jessie Matthews in "Evergreen" (1934), appeared with John Mills in "Forever England" (1935) and played the matriarch in "29 Acacia Avenue" (1945).Balfour had less fortune in her private life.