British trance medium well known during the 1920s. Sir Arthur Conan Doyle sent many people to her anonymously and kept records of the reports, which showed a very high average of success. Her psychic gifts were noticed in early childhood, when she is said to have played with spirit children and occasionally fallen into trance.
Sources:
Doyle, Arthur Conan. The History of Spiritualism. New York: Charles H. Doran, 1926. Reprint, New York: Arno Press, 1975.