I found my hen dead laying under a scrubby red bud tree. It appears that she had been dust bathing.I don't see any marks on her at all. We have poke berry growing in the yard, but I don't think she ate any berries. She had been laying eggs since Aug. 24, 2013. I've been putting out bowls of ground egg shells and feeding layer crumbles with some tables scraps on occasion. She forages in the yard with the rest of the chickens. The yard is completely fenced in. Any ideas?? I've tried to attach a picture if that helps.