i have a delaware white about 5 months old and she is not really active. she just stands in one place and is all fluffed up and sleeps while the others are out and about. is there anything i can do or any medicine i can give her for? hate to lose another one. she is with 7 other hens. her weight seems fine but not really active. should i remove her? i live in seattle is the weather right now is around 40 degrees. thanks!