Olive Loveday Lee Brown was born on 10 August 1884 in Kara Kara, Victoria to parents Lee Brown and his second wife, Jane née Laver. Olive Brown trained as a nurse for three years at the Gippsland Hospital, receiving her Hospital Certificate through the Royal Victoria Trained Nurses Association. Prior to her application to be accepted as a Nursing Sister with the Australian Army Nursing Services on 17 June 1915, Olive spent almost three years as Sister/Matron at three Victorian Hospitals. Olive was appointed to the 1st Australian General Hospital and her unit embarked from Fremantle, Western Australia, on board Wandilla on 25 June 1915. Sister Brown was a single 30 year old and was by then known as Olive Lee-Brown. On 10 March 1916, Sister Lee-Brown joined the 4th Australian Auxiliary Hospital, Heliopolis, Cairo, Egypt. On 20 June 1916 she was Mentioned In Despatches for her good administration work in Egypt. By this time, she was serving in Rouen, France where she remained until 29 December 1918. She was then detached for service with No. 3 Australian Auxiliary Hospital in London, England and for the next year was stationed at various English towns. Olive returned to Australia on 28 November 1919 and was discharged on19 March 1920. The following obituary appeared in The Argus on Saturday 16 November 1940, page 5 - "The death occurred suddenly on Thursday of Sister Olive Lee Brown, daughter of the late Mr Lee Brown, formerly of Kimbolton, Cope Cope, Victoria. Sister Lee Brown was well known in Australia and in England and with her sister Miss A B Lee Brown she served in the last war in Egypt and in France being for some time at No 1 Australian General Hospital, Rouen. Sister Olive Lee Brown was mentioned in despatches and on her return to Australia she took up work with the Victorian Education Department in the Childrens welfare section. She also undertook much philanthropic work especially among children."
Olive Lee-Brown did not marry and is commemorated at the Springvale Botanical Cemetery.
Olive's sister Annie B. Lee-Brown and brother Lee H. Brown also served in the AIF and are honoured with trees in the Avenue.