Bizarre behavior from pullet

[Phoenixsw]

I have a 5 month old Sicilian Buttercup pullet, and yesterday, she started just running around like crazy and flying up onto things. Then she runs into the coop and stays in there. Then she comes out, runs around like a freak, then back in. She's not physically injured, and the other 11 birds I have are fine, so I just have no idea what might be going on with her. Any ideas?

 

[Pork Pie]

Maybe should could be about to lay and her hormones may be causing the rather strange behaviour? It is normal for pullets to spend time in the coop / nest boxes prior to beginning to lay. Just prior to laying, some pullets do exhibit some out of the ordinary behaviour.