Patricia Wentworth

Born Dora Amy Elles in Mussoorie, British India, Patricia Wentworth was a British crime novelist who later became especially well known for her Miss Silver books. She was educated privately and at Blackheath High School for Girls in London, and she published under the pen name Patricia Wentworth.

Her detective, Miss Maud Silver, appears in dozens of novels and is often compared with other great golden-age sleuths for her calm manner and gift for seeing what others miss. Wentworth also wrote under the name Dora Amy Elles Dillon Turnbull during her life, and her work helped secure her place as a lasting favorite with readers of traditional mysteries.

The dates given here in your prompt are slightly off: the sources I found list her as born on October 15, 1877, and deceased on January 28, 1961.