I have a 2 year old RIRXAustralorp hen. She's never been sick or had any problems. Today I noticed that sometimes she seems to be laying down while the other hens are wondering around scratching in the yard. She's in the same spot as them, just laying there. When I go to pick her up she's feisty as ever and runs away, then starts pecking again. When I go outside, the other hens come running. She eventually follows them. I've never noticed this behavior before. She seems fine besides being lethargic. Any ideas on what it could be? We did manage to pick her up and I felt around and everything felt normal.