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That said, she could have gone to Scotland or Ireland or anywhere on the Continent, or simply become a live-in servant with one of the country houses. Or simply changed her name if she didn't want to be found. There's also the possibility of accidental death or foul play where the identity of the deceased is unknown - much more common than you might imagine, though the the deceased in such cases are overwhelmingly men.
I also obtained a copy of a death cert for Lily Wheeler in 1952 and this shows her as the wife of Charles Longford Wheeler age 74 - so this would match to the DOB. The informant is stated as W E Davis, Son in Law, but I have no one with that name.