Dimsdale was active in the
Cambridgeshire Liberal Association, whose MP,
Edwin Montagu, was a member of the Coalition government led by
David Lloyd George. He, the local Liberal association and Dimsdale all went over to the newly formed
National Liberal Party in 1922. She took an active part in the affairs of the new party at a national level, and was appointed as a joint Honorary Secretary of the Council of the National Liberal Party. Montagu lost his seat at the 1922 General Election and chose to retire from politics. Dimsdale was selected to succeed him as candidate and following the merger of the two Liberal factions, she became
Liberal Party candidate at the
1923 general election. She failed to win back the seat and did not run for parliament again. She served as a Liberal member of Cambridgeshire County Council for some years. During
World War II, Dimsdale hoped to organise the evacuation of some British children to Canada. ==References==