I think Star Wars was fumbled, but she also produced/exec-produced ET, Jurassic Park, Indiana Jones, The Sixth Sense, Twister, War of the Worlds, Back to the Future, Lincoln, Who Framed Roger Rabbit, Gremlins, The Curious Case of Benjamin Button, Seabiscuit, Shindler's List, The Color Purple, The Goonies, The Land Before Time and much more.
I don't think you can have a track record like that and be bad. There's something else going on.
This is a post about Pixar, and you're calling for Kathleen Kennedy (who has nothing to do with Pixar) to be fired? You may not like them, but the Star Wars projects she produced made a ton of money. The layoffs aren't because of her.