In June our chicken stopped laying. Now in October she is huddled up, lathargic, for the last 2 nights she hasn't been able to get in coop. This morning she won't eat or drink. She is very unsteady on her feet. I've mite powdered her, wormed her, given her poultry spice in mash (which she wouldn'e eat), she has had keep well pellets. Honey and water to try and boost her up (this was suggested to me). What could it be? I've tried to match symptoms but failed. Could she just be an old chicken? (apparently when we got her in may she was twenty weeks old but we don't think thats right as she stopped laying and went through her the moult in July)