Lucy is a leghorn, about 3 years old. She's been having diarhea trouble for weeks. I've treated the flock for mites, lice. I've had them on a 7 day course of Terramycin. Lucy's the only one who's still having problems. When she started vomiting yellowish liquid this morning, I separated her from the rest. Not sure what to do from here. Her comb is full and feels a bit hard. She's not eating. She's standing, but not energetic or interested in anything. HELP!