This is my first time raising chickens and its been a blast! I have 2 leghorns and an Americana that have been laying since mid-August. For some reason though the Americana stopped about 3 weeks ago. She sits in the coop on the eggs layed by the leghorns and seems liken shes trying to lay but its been a while. She isnt moulting, she doesnt appear to be sick, she just doesnt lay. They all use the same nest so she gets up and lets the other 2 lay and then sits back down on it. It's not cold yet in Vegas so I don't think that's it. We haven't changed their food or done anything different to their pen for her to be stressed out. Any ideas?