Let them out approximately 30minutes ago because they are free range. I have 3 houses where they sleep, and they sleep wherever they decide, she slept with the ducks last night, they always have plenty of straw and water and food.. This morning she came out and sat straight on the floor near the door, her eyes was white over and she kept crowing/ opening her mouth really wide, so I gave her some fresh water and she carried on flapping her wings and her eyes going white over and her beak open. I popped inside to get a cage to pop for in for a while to keep an eye on her, went out and she was flying against the wall. I went to pick her up and she was totally cold and her eyes wont open, I think shes dead, i've popped her in a carrier in the back room just in the hope she will come back :'( All white stuff came out of her mouth.. She was wormed over a week ago with Verm X. They occasionally have poultry drink (red liquid) in there water. For vitamins. She was eating fine as she had some bread and corn before she went to bed, looked totally fine. Minus all the crying i'm now worried about my other chickens.. She is a warren approximately 30 weeks old, had started laying her eggs. She was eating laying pellets, lettuce, bread, pearl barley.