I have a 2+ year old laying hen that has been lethargic and not eating since Saturday. I found her upside and almost lifeless in her coop Saturday morning. The only symptoms I can confirm are that she is unable to stand up, is very lethargic, and hasn't been able to eat or drink on her own. I've been feeding her yogurt, watered down mash, and water by syringe every few hours. I started her on an antibiotic yesterday. There's been no improvement. She occasionally shakes her head rapidly - just out of the blue. And she does opens her eyes when I feed her. I'm concerned she might have worms so I took this picture of her poop from earlier today. We have one other hen that does not have any issues (at least as of right now!). I appreciate any advice you can offer. Thanks!