Hello. My chickens have been acting very strangely. They have been laying for about a month now and just recently I noticed that one of my chickens was laying away from the coop in a random location. When I picked her and her eggs up and brought her to the coop she quickly ran back to the same spot without eating my treats and leaving the flock to walk through the snow (which all of the other chickens are hesitant to do). I simply thought she would need to be confined in the coop to reestablish a since of home as the articles said online; however, while I was out getting food for them and I got home 20 minutes later i saw that the same chicken had passed away all of sudden even though she was running around and seemed completely fine. I buried her and not 10 minutes after that another chicken was very desperately trying to run away from the coop to lay in a different spot on her own. I am afraid that this same behavior will lead to the same outcome. Can someone tell me what's wrong with my chickens? They are leghorns, it's the middle of winter, they are young, they have food and water and there's 4 of them (now three) that have 3 nesting boxes that they never used but they also have never laid outside the coop.