My 2 year old RIR/Leghorn cross had been acting ill for a bit now. The rest of the flock had a respiratory infection treated with Tylan and appear to be much better. One girl, Sadie has been going around puffed up (but has a habit of doing that most winter) lethargic, not as interested in food, although she did pecked at a piece of apple the deer left behind today and does eat snow when she goes outside on nicer days. She has been "shaking" her head and passing loose stool that is clear liquid and yellow mixed. Cocci????? Any suggestion before I haul her off to the vet????? Thanks