I just found this entry on page 56 of the Commonwealth War Graves Commission List of Female Casualties of WW1:
Staff Nurse Annie Winifred Munro from Pietermaritzburg, Natal, South Africa, a member of The South African Military Nursing Service who died on 6th April 1917.
By strange coincidence, my aunt - Audrey Jackson - was born on 6th April 1921. According to my Mother, her Father returned from his service with the Royal Field Artillery in WW1 around Christmas 1919. Audrey served in the Women's Royal Naval Service during the Second World War and was at Fort Southwick, Portsmouth on D-Day. She met and married a soldier from South Africa and went to live in Pietermaritzburg after the war where she died in the spring of 1948.
WE WILL REMEMBER THEM ALL