Mary Cecily Barber (nee Bedford) was a teacher at Diocesan Girl's School. The Directory & Chronicle for 1940 here shows her name as Miss M. C. Bedford as staff of DGS.
DGS records give her name as Barber (Bedford) Molly and work record as 1924-1941 and 1947-1948. During the Battle of Hong Kong, she worked as a kitchen supervisor at La Salle Relief Hospital.
Source:
1. https://www.chinafamilies.net/internees/7201-barber-mary-cecily/
2. http://www.hongkongwardiary.com/searchgarrison/nonuniformedcivilians.html#_Toc43367486
3. e-Book "Daily Giving Service - A History of Diocesan Girls' School, Hong Kong" by Moira M. W. Chan-Yeung and Contributors. See here
4. "Molly" Barber's name/signature appears under "La Salle College" (La Salle Relief Hospital) on the far right on the "Day Joyce Sheet" held by the Imperial War Museum.
See: https://www.iwm.org.uk/collections/item/object/30083388. An explanation of the "Day Joyce Sheet" is given at: https://gwulo.com/media/46458