My hen is about 4, she hasn’t laid an egg in about 6-7 months although we have been in the cold winter of chicago. For the past 2 months she hasn’t been herself, very slow, lethargic and low energy. She will eat a bit of feed and veggies in the morning but by mid day she is fluffed up and has no interest in food. She recently had a protruding vent and vent gleet but both have been resolved. There are no worms or blood in poop. Her comb seems to be shrinking and her weight seems to be down. Please help