After her education Faithfull worked at Birmingham Settlement, a charity working with vulnerable people in Birmingham, UK,  running clubs and acting as a caseworker For three years until 1935. She then entered the education department of the London County Council as a care committee organiser.
After completing her education, Faithfull dedicated herself to helping vulnerable people in Birmingham, UK, by working at Birmingham Settlement for three years before transitioning to a role within the London County Council's education department focused on supporting vulnerable individuals through care committees.