Question: When did Dolores Guinness's mother die?
Sentence (from "Gloria Guinness"): Gloria Guinness (born Gloria Rubio y Alatorre; August 27, 1913 – November 9, 1980) was a Mexican socialite and fashion icon, as well as a contributing editor to "Harper's Bazaar" from 1963 to 1971, considered to be one of the most elegant women of all time.
Relevant evidence: Yes