She became a teacher at Allenswood for a few years, but then met the feminist Emily Davies, who encouraged her to join the National Union of Women's Suffrage Societies (NUWSS).

[1] Strachey's mother, Jane, was a friend of Millicent Fawcett and was already active in the NUWSS,[2] so it was relatively easy for Pippa to become a committee member, then in 1907 to become secretary of the organisation.

[3] Strachey supported World War I, but was unable to work in field hospitals due to her health.

Under her leadership, the organisation created a substantial library and purchased a building to use as a social club and headquarters.

[4] She was made a Commander of the Order of the British Empire in 1951, and finally retired that year as secretary of the Fawcett Society.