My husband just came in from locking up the hen house and he found one of our hens roosting on the floor. He noticed her waddles are cold, while the other chickens have warm waddles. He put her up on a roost and she stayed. He also noticed she has had diarhea and there is a drainage from her vent. She's been acting strange for the past couple weeks. She's been going in to roost early, often a couple of hours. If we checked on her, she would be asleep. In the morning, she's often been the last one out. She is a 3-year old Barred Rock. We are worried she may be dead by morning. Any ideas and/or advice would be greatly appreciated.