She worked in the Cavendish Laboratory in Cambridge from 1943 to 1946 and was president for Scotland of the Girl Guides Association from 1979 to 1989.
[citation needed] Carnegy was chair of the Working Party on Professional Training in Community Education Scotland (1975–77),[4] Commissioner at Manpower Services Commission (1979–1982),[2] and a member of the Scottish Council for Tertiary Education (1979–1984).
[2] From 1980 to 1983, she was chairman of the Manpower Services Commission Committee for Scotland.
[citation needed] On 14 July 1982, she was made a life peer with the title Baroness Carnegy of Lour, of Lour in the District of Angus[5] and in 1993, an Honorary Fellow of the Scottish Community Education Council.
Carnegy was a Fellow of the Royal Society of Arts (FRSA) and a Deputy Lieutenant for Angus from 1988 until her death.