I have a 6 year old barred rock hen who hasn’t laid an egg in 6 months. When she first became sick I treaded her for vent gleet. I re introduced her back to the flock & she seemed to recover. Recently she started staying in the coop, feathered posturing, not eating much & her sight even seems affected. I have isolated her again. She has no breathing issues, her poop seems normal. She’s eaten some blueberries & cat food. I feel like there is something more serious going on internally? Any suggestions? When do you start to think about euthanasia? I really hate to see her suffering. I’ve called all over & no vets will see a sick chicken!!