Hello, I'm desperately in need of advice. My 18 month of ex battery hen has been laying shell less eggs for past month or so, also some thin shelled eggs (previous to this was fantastic regular layer). She normally leaves an eggy mess in coop during night and her bottom is all eggy and messy. last week I found her hunched, not eating, not moving much, shutting eyes in her run, basically very ill and fed up. I isolated her brought her inside and fed and watered her and warmed her up. I didnt expect her to make the night but next morning she was fine. Been about a week with no eggy mess (or eggs) although other two have stopped laying now it is colder. I've worked them all, de mired their coop and them and now provide extra vitamin/mineral supplement in their water. They have special ex battery feed with added vitamins, calcium etc... They have grit and oystershell available. They have greens, pasta, cooked potatoe, bread, veggies etc... As additional at end of day. This morning I find her hunched again, not eating, messy eggy bum, eggy patch in coop (although other chicks eat remenance). I don't know what else to do. I'll bring her I doors later as its not too cold today but will be tonight. It's every time she lays a shell less egg which obviously breaks inside of her, or gives her a tummy ache. Would the vets do anything? I've tried extra calcium in giving them cooked egg shells. Any advice please. This chicken has always been skinny, bald in places and smallest of trio. I rescued them all from battery factory approx 6 months ago Other two have fattened up and are thriving. Previous to this she has always been feisty, active, friendly, hungry etc... So don't know why this has started.