I noticed one of my laying hens was a little quiet yesterday, but today she is very lethargic and her eye lids look a little swollen. She normally has big round eyes, but they are kind of half closed today. I saw her have a little diahorrea, which was yellow & white. She hasn't eaten anything at all today from what I can see. I can't see anything stuck in her vent & she seem to have no injuries. She's normally a very lively, naughty, healthy hen. I wonder if these symptoms ring any bells with anyone? I've made her a quarrantine pen indoors & I will keep cheking she is getting fluids. Also, can I give her some pet electrolyte mix in her water? Let me know if you need a picture & I will go take one.