Update: This morning I moved her to my garage. My chick brooder is being used as a chicken hospital for the second time now. I threw some hay in there for her to forage in, but she immediately made a nest and laid an egg! I found her sister walking around behind my coop again today. She wouldn't come near me, so I put a bowl of food out in a cage. She went in and ate it. I'm going to let her go in and out of the cage for a few days so she gets comfortable in the cage, and then when she's not paying attention I'll lock her in there so I can bring her inside and care for her. I feel bad that she's by herself outside. She's in worse condition that the one I already saved so I really hope I can catch her. She's very nervous about me and super skinny. Her skin is very sensitive from her molt and being so cold. When I had to pick her up to move her, she was in pain. It broke my heart. Last night while she was eating/drinking, I kept hearing noises coming from her that sounds like a belly growling from hunger. Does that happen to chickens when they are hungry? Here's a picture from this morning of her.