[1] In 1941, Marshall joined the Women's Auxiliary Air Force (WAAF).

[2] With the creation of the Women's Royal Air Force (WRAF) in 1949, she was transferred to the WRAF as a flight officer (equivalent to flight lieutenant) on 1 February 1949 with seniority in that rank from 10 December 1946.

[1] In 1969, she was appointed director of the Women's Royal Air Force in succession to Dame Felicity Hill.

[7] She stepped down as director in July 1973 to be succeeded by Molly Allott,[8] and retired on 1 September 1973.

[1] In the 1956 New Year Honours, Marshall was appointed an Officer of the Order of the British Empire (OBE).