A few nights ago, I noticed one of my chickens behaving oddly. She was holding her wings low and isolating herself from the group- she wouldn't go in the coop at night. I put some wormer in their water and she started acting normal again. Tonight when I went to close the coop, she was the only one outside again. She's still holding her wings low, and her vent is dirty. Other than those things and isolating herself, she is acting normal. She's currently pecking at my sleeve and sitting on my foot. She's also chirping continuously. I have corid, wormer, Antibiotics and vitamins and electrolytes, but I'm not sure what to do from here.