There's something wrong with my Henny Penny. I hadn't seen or heard from her all day, but didn't think much because she often spends most of her time in the neighbors' yard. A couple hours ago I went into the pen to check and found her laying on her side, butt feathers covered in poop. There was even an egg laying behind her, so I knew she'd been there all day. I picked her up and washed off her feathers, then sat her in a cardboard box inside the house. There's a fan blowing cool air around, she's drinking and eating some. We think she's a Rhode Island Red, but don't know her exact age. She's somewhere between 6 and 9 years old, which might be old for her breed but we have chickens that are older. Could she just be very dehydrated... or is she ready to go? She isn't pale or breathing heavily, and her poop seems normal. She's unable to stand, but changes her position now and then. Should we prepare for the worst? Please help.