I just introduced a new flock of 3 to my flock of 4 and followed all the right steps and it went very smoothly. However, the last two days the hen highest on the pecking order has been acting weird. The first day or two she didn't want to leave her roost. Today she is kind of just laying around. She's drinking but doesn't seem interested in eating. There is also some green droppings in the coop from overnight. She still gets up and walks around if I walk towards her. Everyone else seems healthy and fine. The new flock is still a bit too young for me to know if there is a rooster. At first I was thinking she might be upset if the pecking order has changed, but now I am concerned she might be sick. Any advice?