A number of her poems were set to music by her sister Florence Eva Simpson (Elva Lorence; 1865–1923) as songs which were published and widely performed.
They also collaborated on several operettas; the comic opera Nanette or The Mermaid's Bubble (1896)[2] and A Peep into Flowerland or Terra Flora.
[13] Simpson became a leading figure in social welfare organisations and a sought-after speaker on a range of subjects.
[17] On her mother's side, she was part of an old north country family, being a great-great-granddaughter of Lord Lever of Alkrington Hall.
[21] She was married in Darlington on 18 September 1906 to John Pearce Ellis (1838–1925), a farmer 20 years her senior, after which her writings were often created under the name of Kate A.