I have a two plus year old Buff Orpington that has been solo for a few months after losing three to heat and one unknown cause. The last four days she has been inside the coop all puffed up. She went through molt in Sept/Oct, for a minute I thought she was going through it again but she's not losing feathers. The next thought was is she trying to hatch but there is nothing with her to hatch. I can get her out to have worms and get a drink, she seems to be eating and she isn't pooping inside so my guess is she is getting out to go. I've got 4 week old chicks coming along so I put her in a kennel with them to see what she'd do. All she did was eat their feed. She barely acknowledged them. She looks like aTom turkey all puffed up.