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My GBB acted scared of a cricket when I tried to feed her. Luckily I got it out of there when I saw that.
She has a weird discoloration on her abdomen. Pic provided.
Evidence of her molting soon?
It has just rubbed off urticating hairs from those spots, so no need to worry. Sometimes they get completely bald on the butts if they keep flicking. The hairs loosen in small, soft clusters and looks like dust or dandruff when in-between setae (longer hairs)
Urticating hairs cause irritation and flicking them is the main defense mechanism of the new world species. They also rub off the hairs on the web when creating a molt mat to have a layer of defense when otherwise completely helpless.