For a couple of days my 3 year old flock of white leghorn hens have had a bit of poop sticking to them. I assumed maybe worms and was going to get wormer today. This afternoon when I went to check on them 1 girl was sitting under their outdoor (penned) roost looking listless. I moved her to my emergency "hospital". As I picked her up, white and clear stinky runny poop ran out of her. I put some Sulmet in water for her, but she is not interested so far. She is mostly just lying there chest down, head down, eyes closed. Her comb is somewhat purple, but those are the only symptoms so far. Any idea what I am looking at and what treatment I should use? Treating her myself, no chicken vets around me. And assume would need to treat whole flock with something? I think she is in a pretty bad way.