My Barred Rock hen was acting wierd the other evening when I was checking my flock. She was very lathargic and would'nt eat. this was accompanied by the squirts and gorging herself on water. she went from the nest to the waterer and did'nt move for approx 2hrs before I moved her to the house. from there she got worse, she stumbled across my basement in the middle of the night and passed. when I first noticed her becoming sick I administered antibiotics. I am stumped, the only thing I can think is she got into something while free ranging the yard. We have not treated or sprayed with chemicals since we have lived here approx 1yr. any ideas?