 After Size became Deputy Governor of Holloway Prison in 1927, she gave the children from her former school clothes made by the Holloway prisoners.After moving to England in 1906 at the age of 23, Size became a prison warder and initially spent two months of probation work as an officer in Manchester Prison before moving to Aylesbury Prison to receive hospital work training "from the only fully-trained nurse in the [prison] service.In 1912, Size was appointed school mistress to the Borstal school at Aylesbury Prison, where she had initial difficulties in establishing a system to adequately contain and care for these troubled girls, who numbered about fifty, at the school - in part due to her pupil's different social backgrounds, their physical and mental condition, and their previous education.