She was only meant as the catalyst. They didn't care if it didn't fit her normal personality or powers. She just needed to end the Avengers, so Bendis could start the New Avengers and depower mutants because they didn't want millions of them in the universe. Because Quesada thinks that millions of mutants in a world of billions of people makes them no longer a minority, lol. Even though you can still have a high population and still be marginalized. He's a doofus.