I have a 25 week old pullet who keeps falling asleep standing up outside, I have seen her do it twice now, once a few days ago and once today. I have some pictures to show you. Please help me with what is wrong with her, she is not lethargic and doesn't seem too bad but if something is coming on to kill her or give her really bad health, I think this is the best time to catch it. What could it be ? She wakes up if you call a name or tap or something.