I have an almost four year old Buff Brahma. She doesn’t do much anymore. Just lays down. I have to wash poop, etc off her underside because it gets stuck in her feathers in clumps. I don’t know why but she’s been like this for months. I treated scaly leg mites on her. Those seem to be gone. I’ve trimmed her claws. Maybe overweight? I don’t know what to do. Any suggestions?