There is the possibility that what is obviously a studio portrait was taken for a reason, and that might have been that, in 1935, she left her family in England to travel to....
....Zanzibar to take up a post in the colonial service there. This picture shows her outside the entrance to the flats where she lived, some time in the late 1930s and........this shows her in 1940 when she married my father.Looking at the pictures, I think there is a strong chance that someone, perhaps her mother, had the studio portrait taken of her just before she sailed for the romantic island where she was to meet my father. If so, then she would have been twenty-two in the portrait.
It was just as well they had the portrait as the war intervened and she was not to return to the UK until 1946, when she brought me, aged one, 'home' to meet the family.