I have a 4 year old hen that has been losing a lot of weight. I haven't noticed her eating, only drinking. Today I let the chickens out and she didn't even touch the pasta I put out for them. The only thing she did was eat the snow and she didn't drink the water. She barely has any energy and doesn't dig or do whatever else chickens do. The weather here has been a little weird because it has been going from snow storms to rain showers to freezing weather to hot weather and I was wondering if that's throwing her off. She isn't laying but she stopped about a year ago. Can someone just please tell me why she isn't eating and what I should do? Thanks so much.