Our 8 yr old just became very lethargic, walks very slowly, keeps head down when walking. Won't eat her food, ate a treat. Temp is 100.5. Has a little swearing cough every once in awhile. Shivering a little at times. Understands when we talk to her Perfectly fine until a few hours ago. Has gone outside to pee and poop. Any thoughts what's going on or what to do?