Sometimes, lack of proof is the best you can get. It sounds like you've made a really good effort to figure out her real heritage, and while you haven't been able to do that (yet), it looks like you've got a strong case that there is no evidence for the connections shown. If it were me, I'd just make the changes and write it all in notes. But then, it does sound like you're up against more than just one bad profile if the false info is all over the internet. I wish I had ideas for you on where to turn for help on this but it sounds like you've already tried everything I could suggest. Good luck to you!