Most of the other kids seem to have been through major trauma of some kind, from family breakup to abuse. All except for jada, who I think was just spoiled rotten by parents who have no idea. If they give in to her now, she has no chance.
But I'm guessing that makes it harder for her to change. The other kids were mostly sad and unhappy and hurt, acting out of defensiveness and pain, and change has to be a good thing. jada always got her own way -- why would she want anything to change?
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"We all agree that your theory is crazy, but is it crazy enough?" Niels Bohr