Robb was a member of the Northern Ireland committee of the National Trust, to which she presented the family home, Lisnabreeny House, Castlereagh, in 1937.
She was the registrar and advisory officer to the Women's Employment Federation between 1940 and 1944, during which time she wrote a partial account of life An Ulsterwoman in England in 1942.
She returned to Northern Ireland in 1944, working for a number of public bodies including PEN and the National Trust, and writing.
In the same year her edited The arts in Ulster with John Hewitt and Sam Hanna Bell, which argued that any mention of politics should be excluded from collections.
She produced a final volume of poetry in 1970, Ards eclogues, and was elected a Fellow of the Royal Society of Literature.