My only white leghorn hen is just over 1 year old. She has out performed all my other hens since she started laying. In fact, until a month ago, she had never missed a single day. The one day she did not lay an egg. She resumed and did ok for few days then missed another. Soon she was missing 2 or 3 days in a row. My hens are cooped up only at night. They have a lot about 25' X 100' to roam in each day. I feed them scratch every day in addition to laying pellets, keep fresh water in 2 locations for them and keep their coops reasonably clean. 2 Months ago, I started letting them free range 2 hours before dusk. They return as they should and it actually help egg production.
Now my problem. This evening when I went up to tend my flock, I released them as usual, and they all went out except for the white leghorn. She was standing by one of the water bins, occasionally taking a drink. I watched her do that about 15 minutes, she drank more water than she would have normally drank in a week. I finally went over and picked her up, without any objection from her, and water started pouring out of her mouth. I tilted her head down and more water came out, crystal clear. I did it again and more water, each time I did this more water cam out, and it started to have a tint to it, not bloody but brownish. In the end I must have emptied at least a 1/2 pint of water from her, maybe more. She is now isolated with some food but no water. Any ideas?