I have a flock of 5 chickens, and I noticed 1 of them has been acting quite off for the past few days. I'm aware most flocks have a 'pecking order', and it's happened before in my flock, yes. This one hen in particular seems to be standoffish from the rest. A few times I noticed her staying in the corner of the coop. And whenever I spread some treats around, she'll usually be very hesitant to eat. Her feathers are a bit tattered, but no wounds as far as I can see. She acts very sluggish and tired. I've created this fenced off area inside the coop so she'll be separated but still with them. Her crest also does seem a bit on the pale side, or simply more dullish than the others. Any tips or feedback on what I can do? Or does anyone know what's wrong?