[1][2] Keogh's first public performance came when she was fourteen and she accompanied her aunt Sylvia Dormer at a recital in Mariner's Church, Dún Laoghaire, County Dublin.
In the 1950s, she focused on raising her family but returned increasingly to work as a freelance musician from the 1960s.
[1][2] Her pupils included Nicola Lindsay, composers John Buckley and Fergus Johnston, and jazz flautist Brian Dunning.
She founded the Capriol Consort in 1970, which gave performances of music, dance and song from the twelfth to seventeenth centuries in period costume.
She invited players such as James Galway and Pedro Memelsdorff to teach in Dublin.
The fund is administered by the Arts Council and is given every other year to an Irish flute or recorder player.