found: Wikipedia, viewed September 9, 2024:Lady Caroline Blackwood (full name: Caroline Maureen Hamilton-Temple-Blackwood; born in London on July 16, 1931; died in New York City on February 14, 1996; parents were Maureen Constance Guinness and Basil Hamilton-Temple-Blackwood the 4th Marquess of Dufferin and Ava) - https://en.wikipedia.org/wiki/Lady_Caroline_Blackwood
found: Her For all that I found there, 1973.
found: Her In the pink, 1987:t.p. (Caroline Blackwood) p. 165 (b. 1931)
found: Schoenberger, N. Dangerous muse, 2001:CIP t.p. (Lady Caroline Blackwood) pub. blurb (died Valentine's Day 1996)