Marion St. John Webb
Webb, Marion St. John Adcock
December 5, 1888 – May 2, 1930 (aged 41)
Birth place: Hampstead, Middlesex, England, UK
Browse magazine works (first published 1917)
Source of date of death: [http://www.alamy.com/stock-photo-marion-st-john-webb-portrait-english-author-and-daughter-of-arthur-83357331.html alamy.com]. Wikipedia only says 1930, and references an Oct. 2, 1930 "memoriam" notice.