do you know what was wrong?

[gottaluvchickens]

I went out this afternoon to let my girls and roos out to free range. When I let me out, one stayed in the coop. I went to check on her and she was just sitting there so I picked her up (which is unusal, not the not social girl) I took her to the water, she got a drink and walked back to where she was. A few hours later, we went out to check on her and she was dead. Her comb was purple. Do you know what happened? I don't want it to happen to the rest of my flock!