I post this old death because as recently as the 2011 Debrett's lists her as still living.
Diana Chenevix-Trench Younghusband
Birth
6 Mar 1920
Death
14 Jun 1980 (aged 60)
Burial
Erskine Cemetery
Pickering, Durham Regional Municipality, Ontario, Canada
https://www.findagrave.com/memorial/262088183/diana-younghusbandIvor Chenevix Trench [descended from a brother of 1st Lord Ashtown, and included in the special remainder] (7 Dec 1892-27 May 1960); m.20 Jun 1918 Doris Mary Gaskell (d.22 Apr 1951)
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Diana Doris (6 Mar 1920-14 Jun 1980); m.1st 8 May 1943 (div 1947) Charles Brodie Knight; m.2nd 2 Jul 1947 Gilbert Wadham Younghusband (20 Nov 1919-15 Dec 1982)