The excellent roglo site (http://roglo.eu/roglo?lang=en;i=5547382)
notes that the link with Dugas is probably fictional:
"American and Canadian sites award her a second marriage with a certain Nicolas Dugast. To make the thing a little more likely these sites send her first husband "ad patres" a good number of years before his actual death ..."
I think the connection would be neat, but I don't see any documentation...