I noticed my 4 year old rir hen (Ruby) snaking her neck.this just started today.she will not eat,but isnt lethargic. I picked her up and she threw up about a teaspoon of very light brown watery liquid. I opened her mouth and inspected her throat with a magnifying glass and observed no obstructions nor worms. I then inspected her whole body and everything was normal. I have put her in an isolation pen away from my other hens. Ruby is the senior hen in the pecking order and has been a very good girl. Can anyone help me with this? i may have to put her down and it's breaking my wife's heart and i'm not happy about it neither. Thanks.