Fanfic/fanart of Louis’ wife? No, not that I know of 😛 Most fic writers/artists base their fic/art on canon, not movie!IWTV in that regard.

In the IWTV script of April ‘92, 2nd draft (btw there are a number of cut lines and scenes that are in there, too), there is the mention of her name, and the child’s name:

I’m gonna make a wild headcanon that the angel statue over that grave was meant to resemble Dianne de Pointe du Lac.