I have seen my great aunt described as such.
She is on a Streatham memorial:
http://www.arthurlloyd.co.uk/Burials.htm#streatham
But her real name was Mary Jane Elizabeth Hawkins, nee Darling.
Here she is in 1911:
http://interactive.ancestry.co.uk/23...nSearchResults
Do you think a Portsmouth woman could have passed herself off as an American?