Mabel Quiller-Couch was the daughter of Thomas Quiller-Couch of Bodmin and his wife Mary (née Ford), and younger sister of the critic Arthur Quiller-Couch. She was one of five children of whom Arthur was the eldest son. After a disappointment in love she lived with her younger sister Lilian, also a writer, in Hampstead. Of her 26 publications, one was jointly written and one jointly edited with her sister. Lilian M. Quiller-Couch was the author of a number of novels and the compiler of an anthology of writings about the University of Oxford up to 1850.
A Book of Children's Verse; arranged by Mabel and Lilian Quiller-Couch; illus. by M. Etheldreda Gray. London: Henry Frowde; Hodder & Stoughton, 1911
(Edited with Lilian Quiller-Couch) The Treasure Book of Children's Verse. New York, G. H. Doran, 1911 (there are also later reissues of both the British and American editions)
Cornwall's Wonderland. London: J. M. Dent, 1914 (Contents: How Corineus fought the chief of the giants.--The giant of St. Michael's Mount.--The legend of the Tamar, the Tavy, and the Taw.--The strange story of Cherry Honey.--The fairies on the Gump.--The fairy ointment.--The exciting adventure of John Sturtridge.--The true story of Anne and the fairies.--Barker and the Buccas.--Lutey and the mermaid.--The wicked spectre.--The story of the lovers' cove.--The silver table.--Cruel Coppinger, the Dane.--Madge Figgy, the wrecker.--How Madge Figgy got her pig.--The story of Sir Tristram and La Belle Isoult.)