She and two other hens are able to get out of the pen and roam around the yard, but I can't imagine where she would have come into contact with any sort of poison. We haven't used any pesticides/herbicides since we got the chickens (June 2009) and I've never purchased rat poison. She also hasn't left the chicken yard in about a week and I can't imagine someone purposefully poisoning my birds.
By "funny" I mean she's just not acting like herself. She's usually very talkative and will start talking as soon as she sees me. Last night when I went out to close up the chicken house for the night all 6 other chickens were on the roosts in the house and she was asleep on the ground part way under their house. When I picked her up she was rather unresponsive and groggy. I brought her inside and flipped her over to feel her belly (thinking possibly egg bound - she started laying on 1/24 and laid an egg a day through 1/30 when we got about 7 inches of snow, all four of our laying hens have had a drop off in production since the snow). She seems extremely scrawny. I've never really felt around her belly before, but she just seems to be all feathers and bones.
She spent last night in a dog crate in a spare bedroom. I gave her a stick to roost on, but she doesn't want to roost. She's just sleeping on the floor of the crate (with the white cotton sheet as bedding). I gave her water with "Poultry Nutri-Drench" and put a small bowl of feed in the crate before I left for work.
I haven't really gotten much response on BYC, I included my picture from that forum because it seemed easier to access than uploading the picture again here.
When I checked on the other chickens this morning I saw what appears to be worms in the poo of one of the other chickens (a Golden Seabright). I'm not 100% sure it's worms, but if it is could this cause the symptoms I'm seeing in this other chicken?