Many times when you watch her play these days she doesn't even have a plan A. She hasn't totally made up her mind what she wants to be in my opinion. A defensive player as she was when she was on top or a more aggressive player and she ends up being neither and making far too many UE on routine shots.
That's because she tends to be all over the place from match to match, and even within matches. One thing we often see these days, she comes forward a lot, this is all well and good, but her net play is poor, vs anyone half decent it's too often not been a profitable play, but she will keep at it. And this is the main I don't really understand, she does things that don't really play into her strengths. You'd assume that if this is her game plan that she's working on her volleys in practice, but if she is, you'd never know it. Her volleys are pretty much as raw as they've always been.
Then you have this whole aggressive vs defensive mindset. She'll try to be aggressive, but anytime she's up against a player with anything like an attacking game she struggles to do it. She needs too much time to build her points when she's trying to be aggressive, time you never get vs any decent aggressive player (and we're not even talking anywhere close to the best aggressive players in the world here). Then you are left with her trying to be an aggressive player, but forced to be a defensive player, where her defensive game just isn't as good as it once was, she struggles with her consistency from the back of the court, and she just gives her opponents too many points, whether that is through bad errors, or just giving her opponents easy balls to attack.
The main questions would be what does she actually work on in practice. The noises from her camp, and what we see would suggest it's on being an aggressive, attacking player. Do they seriously believe she's ever going to be standing toe to toe, trading blows with the best players in the world? Right now she can't even do it vs mediocre aggressive players. I've lost count of the average players that have beaten Caro at this aggressive game.