My 4 week old Buff Orpington constantly closes her right eye. Can someone tell me if this is something to be alarmed about? Other than keeping one eye shut most the time she is active, eating, and drinking fine. We have 5 other young chicks about 2 weeks older than her, all different breeds. No one else does this. Just a new chick Momma here, trying not to be overly concerned but don't want to wait too long if it is something!! Thanks in advance for your input.