Lady Beatrice Violet Greville, né Graham, was the daughter of the 4th Duke of Montrose. In 1863 she married the 2nd Baron Greville, who succeeded to the title in 1883.
Lady Beatrice Violet Greville was a sports, novel and memoir writer. She seems to have known JW's biographer, Elizabeth Pennell.
Who's Who, 1898, London, 1898; Who Was Who, 1929-1940, London, 1941; British Library Catalogue.