No source checked for this entry gives a birth year or biographical detail beyond her authorship of Your Days Are Numbered (1931) and a reported death in late 1964; her public identity survives almost entirely through the one book.
What would resolve this A period publisher archive, obituary or genealogical record establishing her birth date and life outside her published work.
OpenArchival research, history of American occultismNewcastle Publishing editorial staff, Florence Campbell (publisher biographical note)