Barty's the favorite, for sure. And it would perhaps be eyebrow raising if she fails to win it. She's lost only one match in over eight months to a player ranked below her.
Of the players left in the draw, I only see three that would be acceptable losses:
Venus could be a threat if she's zoning, but that hasn't happened in a while.
If the Latviathan shows up with a first serve and isn't hitting wildly, she could be trouble in the final, too.
And Goerges, who both knows how to play on grass, knows Barty's game (doubles partners, have trained together), and seems on one of her annual upswings could be trouble, too.
But a loss to anyone else would be a pretty significant upset, and an indication the pressure got to her. I don't think it will, or it is. She really seems to have a sense of one match at a time and all that.
This is a weird thought: about a year ago, Jon Wertheim had Jared Donaldson on his podcast, and he made an interesting point about improvement: you can't be focused on "I want to win more matches" or "I want to win more points each match", because those are out of your control. But if you focus on marginal improvements to each area of your game ("I want to hit my forehand 5 kph faster, I want to hit my kick serve with 5% more rpms, I want to hit slice backhands with a 5% lower bounce", etc.) you actually can train for that. Barty seems to embody that more than any player I've seen in ages.
And more than the purely technical, training-based improvements, she seems to have improved her point-to-point, game-to-game focus in the past year.
I think that Kasatkina loss really shook her awake a bit. Good for all of us.