 Size served as Deputy Governor at Holloway Prison until 1941; both staff and prisoners were evacuated to Aylesbury Prison at the outbreak of the Second World War.Between 1941 and 1942, Size was Governor of Aylesbury Prison, where Size arranged for prisoners to knit comforts for men and women which were sent to the Red Cross Depot at Oxford for distribution.In June 1941, Size was appointed a member of the Order of the British Empire (OBE) in the King's Birthday Honours List in recognition of her work on prison reform.