A few weeks ago I found my hen sitting a lot. When I approached her, she couldn't get up. She laid down down for about a week. Now she is standing but can't walk and her balance is terrible. If you barely touch her, she almost falls over. However, her appetite is fine. She is eating and drinking well and her color is good. I checked her feet and they look good too. Any ideas as to what can be wrong with her? I've been trying to give her time to get better but I don't know what else to do. Any help would be greatly appreciated. Thanks!