My 3-year old BLRW hen, Snuggles has looked a little bit lethargic for a day or two. She's always been pretty light and it doesn't feel like she's lost any weight. She stands around with her feather kind of ruffled and I haven't seen her eat or drink a lot recently. She eats treats (watermelon, smashed eggs, etc.) but I haven't seen her eat her regular food recently. She was drinking and eating just a few days ago, even though she looked lethargic. She is the only one looking like this. All the other chickens are acting normal. She looks normal, other than the lethargy. I walked into the coop and she was hiding in a nesting box. Nobody is bothering her, at least while I was there. Does anyone know what is wrong?