All my chickens were fine this morning. This afternoon I found a chicken lying on her side, struggling to breath, legs extended and almost no use of her neck. It was just hanging and flopping like it was broken. I picked her up and placed her in cold water thinking she was hot. She wouldnt drink or anything. Several minutes later her eyes rolled back and she started having seisure. I ended her life because it seemed like she was not going to recover and I did not want her to suffer. My husband saw a rooster on her just prior to finding her in this condition. What happened? Could he have broken her neck? Should I be worried aout the flock? It seemed very sudden.