15 month old 'laying' hen (sorry dont know the technical term but shes an ex battery farm hen) caught her today sneaking slowly over the grass then snuggled down in a patch and sat there...for 5 hours in the wind rain and hail. i go to pick her up, she stood up, walked calmy away and snuggled down else where. so i go to pick her up again..she stands up, walks off and finds another area to lie in. it started getting dark so thought i better go back and check if shes gone to roost, nope she still curled up in the grass, so unlike her (shes normally first in the hen house) so ive brought her inside to give her a good search over. i cant see anything physically wrong with her, crop has food in, shes not thin, no discharge from the eyes/nose/mouth. no cuts, scraps or other injuries. poop so far has been normal. shes not laying at the moment as shes just finished moulting. but shes not right she never sits still like this....... any ideas??