I have a 4 year old buff silkie. She has not laid eggs since this past May. I am in Texas so it is very hot and humid. She eats but not as much as when laying. She moves around, but not as much as she used to. She has normal white capped poop although it is usually firm and before she would have a few messy poos. I see no evidence of lice or mites. I did dust her once, but hate to do it if there is no evidence of parasites. My question is could she just be getting old and her laying days are over?