I guess it is what she expects but for me she has more to loose than to win.
IMG will not loose much, as they will still get money from her beauty contract whichever agency she goes, beside that they anyway dont count on her anymore to bring more stuff.
Such kind of beauty contract is IMG main goal, when they get a girl to sign something like that, they prefer to start to put her gently away from fashion, and if possible to put her in medias stuff, things that only IMG has the inside connection to do, see Tyra Banks as a perfect example.
so if she switch, yeap, she might get a bit a revival here and there during a few months, but she miss the opportunity to start to be managed for "after" modeling by almost the only agency who can really do it...
not a very clever move i would say...