Sick hen- lethargic

[halfadozen22]

I have a 1.5 year old speckled sussex, today she was standing in the corner of the run all by herself, she seems very lethargic. Was laying down when all the other chickens were standing up and running towards me. She pooped a really explosive diarrhea about an hour ago, so I don't think she is eggbound. She will drink and pecks at her food when I hold it in front of her but doesn't eat it. I soaked her in a warm Epsom salt bath for 20 minutes and now she is inside in a dark pen away from the other chickens. Any advice on what to do, contacting a vet really isn't the best option for us, but I really want to see her recover.