I have a 2 and a half year old sex link hen that is lethargic, has lost a lot of weight - she is just feathers and bone now but used to be very thick - her skin is pale and beak is dry and pale, her comb droops. She eats but not as aggressively or as much as she used to. She had her first molt about nine months ago and never started laying eggs again after she molted. She started growing spurs about 6 months ago. We have 4 other chickens, two of them the same age as her and two chicks 5 months old. The other chickens are all fine. I have looked at her bottom and picked through her feathers and I don't see any bugs/mites anywhere (if she had them would I be able to see them?) Any ideas what might be wrong or how to treat the sick chicken? Thanks for your help.