I have a hen who turns 4 months old on Tuesday. I am worried about her. The last couple of days she has stayed in the coop in the morning, not coming out to greet me like the others do when I bring their morning water and food. Eventually she has come out and drunk. Today she came out for a time, but went back in and stood on the nesting box. It has been very cold here the last few mornings, around 23 F or so. Later in the day she did come out and seemed fine. The first time I noticed anything different was about 3 days ago. I had let her out to free-range, and when it was time to go back into the run, I noticed she seemed in no hurry to go in and was sitting on a board, perching on it. I couldn't talk her into coming down and going in. Finally she took the long way to the run, gingerly picking her way over the top of several open trash cans. She did go in. But it was the next morning she stayed in the coop when the others came out, perched on the end, just like this morning. Yesterday I'm not sure whether she came out or not, I think she did. But today she stayed in the coop and then came out, but then went back in. Is it possible she could be broody this young? I'm guessing she's a white leghorn/RIR mix. I also wondered if a roo chick could have hurt her? They are the same age. I haven't seen them try to mate with her, but it is possible. All opinions will be appreciated.