Kitty's tragic flaw is her need to protect those she loves. This includes her friends as well as her family.

It hasn't really been deeply exploited; she's worried about her family, and she was worried when Aubrey and Kasey were disappeared for a while, but nobody's been using it specifically to get to her, if that's what this means. I suspect that if anybody tried, she'd go off ready to kick some ass... in what could turn out to be a spectacularly stupid move. :3