I have an 8 month old Speckled Sussex hen that I found today to be laying down A LOT. She will get up to eat mealworms that I throw on the ground then she'll lay right back down. She will get up and walk normally if I go up to her but she'll immediately lay down again. Her head is drawn into her body and she's kind of puffed up. Her comb is bright red (not pale) and she's not limping. There is no sneezing, no discharge, no labored breathing, nothing other than laying down a lot, being puffed up, and having a withdrawn head/neck. They haven't been free ranging today, they've been in their indoor/outdoor pen. They did free range yesterday and she was fine last night. No other chickens are showing symptoms. Could she be egg bound? Or is it something else? Worms? Parasites? Can a person worm the whole flock or treat for parasites even if you're not sure they have any? As a preventive measure? Any help or advice will be appreciated. This has been a bad week for me and my birds. I had a hen with a prolapsed vent but she's recovered, I have a dying (of an unknown cause) 6 week old Orpington chick that the vet said there's nothing I can do for (but not to worry about the rest of my flock), and now I have this hen beginning to show these symptoms. Thanks for any and all help and suggestions.