You know what, one more post.
It makes no sense that Bonnie doesn’t know Katherine isn’t really dead.
It is shown, in the same episode that Katherine puts herself into Elena, that Bonnie would see her as she dies. She has to pass through Bonnie to get to the other side. But when she really does “die” just a little while later, this obviously would not have occurred since her spirit is in Elena.
Wouldn’t Bonnie find that suspicious as hell? Or is she conveniently absent from the story in the next episode so that glaring plot hole won’t be as noticeable?