I had a BR that was 2 1/2 years old that went from perfectly fine(seemed to be) to dead inside of 3 days. On Thursday she was doing regular chicken things with the rest of the flock and that night went in to shut the coop up after work and all seemed well. Friday morning she wouldn't get down of the roost which was strange for her. I say that because I have a BO and an Austro that think I am their personal elevator. Anyway I went to grab her and she jumped down from the roost but couldn't stand although she did eventually but wouldn't put weight on one of her legs. At first I thought my rooster my have hurt her due to his well less than gentlemanly fashion of engaging the ladies so I isolated her in the shed in a dog box. Saturday she seemed better, eating, drinking and actually put a little weight on the leg. On Sunday she was eating less and let her out for a while to forage for a while, which she did but just wasn't herself. So back in the box she went. So this morning she was dead, just like that. No indication of anything, no runny discharge from nose or eyes, no heavy breathing, no signs of bumble foot on either leg, comb was pink but a little listless. After 2 hard molts and many eggs did her body just quit? Do they die just for no reason?