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Putting together a few sources, it seems likely that she married in 1972 William Sinclair Ault (1913-1986), [1], a graduate of ‎Corpus Christi College, Oxford who worked for Shell-Mex and BP, who died in 1986. I believe [2] is the 2005 announcement of her death. As "Miss A P Udny" she appears in the provenance of a portrait of her great-great-great uncle Robert Udny. As "Mme W S Udny" she appears in connection with something about Nicolas Poussin. ( https://books.google.co.uk/books?id=zqxIAQAAIAAJ p. 196.)

Some day someone might want to know about her. Charles Matthews ( talk) 12:42, 15 November 2020 (UTC) reply