Her younger brother was the classical scholar and political scientist Alfred Eckhard Zimmern.
Elsie Zimmern helped found the Nursery Training School at Golders Green, and was its Honorary Secretary and Warden from 1911 to 1923.
She became active in the National Council of Women, acting as Organizing Secretary of the NCW's Maternity and Child Welfare Committee from 1917 to 1928.
From 1925 to 1930 she was the General Secretary of the International Council of Women,[1] resigning when the ICW headquarters moved from London, as she could not leave her ill mother.
[4] Lady Aberdeen introduced Zimmern to Madge Robertson Watt in 1928, and together they founded a new organization, the Associated Countrywomen of the World.