I don't know. FYI - I added the links to Nathaniel Johnson for his wikitree, familysearch, and find a grave.
She isn't mentioned, but if you look at her Revisions tab, she was definitely added to be the wife of Nathaniel Johnson in 2010. Maybe it was a different guy who has morphed into who he is today because of subsequent merges, or maybe the person was wrong in 2010, or maybe they were right but they forgot to source this seemingly new info.
Right now she is just connected to him as a wife. I tend to leave those alone and let future people researching the family make that decision. I guess I would only unlink if there was someone obviously wrong about it (dates, location, etc) or if the person has been thoroughly researched and known to have only 1 wife (not her).
Otherwise, it takes too much time and effort for you to research to be sure. She isn't messing up the tree now, only if someone is trying to get "complete" info on Nathaniel Johnson, but then if they are they should not be just using what GENI has.
:)
