During this exact scene, GLaDOS acknowledges that she isn't fat. Further proof of this is that Aerial Faith Plate sends out a distress signal, even though the ones before haven't. GLaDOS is just salty for being killed.
the second one was the high-fall boots. In the teaser, it started that it's literally not possible to not land on your feet, meaning the boots have to be REALLY heavy in order to counteract her weight
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