you mean things she's been doing since the last quarter of the game?imo? she just wasn't the inherently lovable, self-effacing kat i remembered. her character just seemed to lack consistency/focus, & her constant reference to herself as 'gravity queen' never ceased to grate. she reminded me of someone who's bought into their own hype :) ...
And she lacked focus in all of GR. Hell, I'd say in GR2 she gained far more focus. Cause i can hardly think of a moment in that game where she doesn't have a clearly defined goal that she's set on fulfilling.