Repetitive behaviour

One of my hens has started running up and down the run repeatedly, as well as going in and out of the hen house like a yo yo. The hen house is definitely free of mites etc. She also throws everything out of the nest box and pushes the other birds out, even though she isn't going to lay. She is eating and drinking well, eyes are bright, comb and wattles red and healthy. She hasn't got any parasites or worms as far as I can see.  If I let her out of the run she calms down and seems better for it. Is she just stir crazy? We are going to extend the run in any event, but any other suggestions would be most welcome. Thanks.

No. She is laying in the hen house. At the moment she is being caught out by the shorter days and so I find her egg under the perch each morning. It may be that having given her a taste of free ranging, that is what she wants to do. Intend to try to keep her amused by hanging up bits of greens around the run during the day and hope she forgets what freedom is like. Would love to let her and the others out of the run, but am just a bit worried that they will escape ( we live on a very busy main road)!