Kalista's state in the meta

Previously, there was a pretty sizable balance patch that addressed some points in champion balance. Some of them feel a lot better now (Garen, Udyr, for instance), some got marginally better, but lost important interactions (Ashe can't frostbite the same target to level up, should be addressed and not glossed over, mind you) and then there's characters that hardly changed after the patch, like Katarina and Darius to name some.

The key word here is hardly changed because there's also a character that was not changed at all which was Kalista. Why was she left out? Am I missing some kind of viable deckbuild for her? Am I supposed to run her in Mistwraith decks or something and hope she does not lower the deck's winrate even with the new support? They Who Endure decks? Thought those are as dead as her and they don't seem to be coming for that vengeance like Kalista, either.

In short, why was she not changed? Is she viable in some decks and her statistics back her up or is it just an oversight? I would love to hear what you all think.