I am having this same exact problem with my barred rock hen. I think your hen sounds worse off than mine though. My hen is still eating and drinking but she is skin and bones and having foul smelling diarrhea. Everything she eats just seems to come right back out undigested. I noticed her toes were swollen on both feet and she was limping. He toes were full of pus. I have been trying a multi level approach to save her. Gave a wormer, have been giving tylan 50, started her on fish mox. Started adding apple cider vinegar to the water and giving some probiotics (kefir). I also have been soaking her feet and applying Prid drawing salve to try and draw the infection out of her feet. So, far she is hanging on but I do notice she is getting very tired now after eating and laying down a lot more. I am hoping she will pull through this. She is currently 3 pounds and she should be more like 6 pounds. I hope you get some helpful suggestions here and that your chicken pulls through. Keep us all posted.
