I have an 8-month old Delaware who stood around looking puffy and sluggish this morning. I brought her in and did the usual if a quaranteen chicken (warm cage in house, favorite foods, vitamins, etc.). She had some interest in food, but seemed really sluggish. I just came back home and found her vomiting brownish-yellow, slimey liquid. Her crop feels full and soft, her vent and poop are normal. I don't know when she has layed last. Her head is on the ground, with liquid oozing out of her beak. I feed my free-range hens Layena layer feed, and a bit of scratch on cold days. Please help!