We have a Buff Orphington hen who used to be one of our nicest hens but about a month ago she started getting cranky. Puffing up when we get near her and striking at us if we put our hand by her. I looked into it and this is normal behavior for broody hens but... she isn't acting broody? Other than her crankiness. She doesn't stay in the nest box other than to lay her egg but they she leaves and continues to join the rest of the chickens outside. She's just become mean! It's sad because she was such a nice hen. Is there a reason for this? Or maybe a way to stop it?