The real thing to worry about is the poop itself. If it's runny, bloody, and mucus-like (kinda clear with a jelly consistency), then she's got Cocci which COULD kill her if left untreated. Thankfully Gleet itself is essentially a yeast infection, and that one is very easy to fix (with the yogurt). Cocci is the one to worry about, but you see most of the symptoms in the poop itself, or in the chicken acting lethargic and listless. The poop can get stuck to them easily because it's runny, but if you haven't seen other problems, she should be fine.