I noticed one of my hens missing alot of feathers on one side of her neck. When I picked her up to look I noticed a big gaping hole. You could see the inside of her neck and her chest. She's still eating and drinking and acting fine. I noticed once when she shook her head little bits and pieces flew out. I've isolated her from the rest of the chickens but still not sure if she'll live. If she's in pain I'd rather put her down if need be. We can't find our heating lamp and its going to be 45 tonight. We think we'll put some hay out for her? Will this keep her warm? Is there any chance she could live from this? What should we do???