We have a little RIR that appears to be a runt. It got rather cold overnight - down to 35. She was in the bottom of the coop, appearing to be gasping. Her eyes were closed. They've been closed all day. I brought her inside to warm her up thinking it might help. She's just laying there, but is breathing. She hasn't opened her eyes, that I've seen. We were just going to bury her and she started moving more. She's still breathing. She actually shook a little like she shivered. Does she have a chance? Should we put her out of her misery? I don't want to euthanize her if she has a chance. Please help! Thank you!