Kate was the daughter of John Dyneley Prince, engraver and printer. She married Arthur Livermore of New Hampshire, by whom she had one child, Susanna ('Susie') Plumridge Livermore.
She was a neighbour of the Whistlers at Lowell, MA, and acquired some of the earliest of JW's drawings, including Duck (M.1). Their friendship was renewed in the 1870s when Arthur Livermore became the US Consul in Ireland. She visited AMW in London and visited JW's studio, where she saw a Nocturne.
Thwing, Walter Eliot, The Livermore Family of America, Boston, 1902; 'Letter to the Editor,' The Times, London, 28 August 1903.