Collet was born 10 September 1860 in London, and died at Sidmouth, Devon on 3 August 1848. She was the second daughter of the radical editor and publisher Collet Dobson Collet and Jane Collet, née Sloan. She became a friend and correspondent of the marx family and engels in the late 1870s. She as educated at North London Collegiate School and University College, London (BA 1880, MA 1885); she was later the first woman elected a fellow of University College, in 1896. Collet later provided John Maynard keynes with recollections of her student days for his biographical essays on William Stanley jevons, who examined Collet in philosophy, and her long-time friend Herbert foxwell, whose economics lectures she attended. An active supporter of women's suffrage and women's legal rights, she supported herself as a student by teaching as an assistant mistress at Wyggeston's Girls’ School, Leicester from 1878 to 1885, an occupation which led in 1891 to the presidency of the Association of Assistant Mistresses in Public Secondary Schools.
From The Biographical Dictionary of British Economists in Oxford Reference.