Marjorie Minna Jenkins Pratt, Countess of Brecknock DBE, JP (died 24 August 1989), was a British peeress. She was the daughter of Colonel Atherton Edward Jenkins and his wife, Anna Isabella (née Schoenbrunn), the niece of Sir Ernest Cassel. She was a cousin (and life-long close friend) of Edwina Ashley, who married Lord Louis Mountbatten, 1st Earl Mountbatten of Burma.

Can we draw the following conclusion?
Marjorie Minna Jenkins Pratt, Countess of Brecknock DBE, JP died August 1954)
No