I don't know Linda Yaccarino well, but so far all her statements, internal and public, read like cringe parody of corporate mediocrity.
Her job is to be corporate and professional - she's there to get advertisers back onboard with Twitter. She's the grownup there to soothe their worries about the instability in the platform. Or she was, until Musk decided to randomly change the basic value proposition behind the site with no warning, undoing anything she'd already accomplished and making it plain that anything she promises can't be trusted because she's completely powerless figurehead.
For her sake, I hope she got her first year's salary up front.
What has she accomplished?
Musk hired her to help improve revenue, and then basically made it impossible for her to ever achieve that goal.
And that’s more than enough.