Thanks for your response. I ended up getting a friend who’s an agricultural vet to take a look at the chicken and he believes it is a damaged or disfigured spin. After manipulating her neck she was uncomfortable trying to have it straightened. She has had an anti inflammatory to see if that...
Did you get to the bottom of this. I have a chicken that is doing all the things that yours was doing. It has a bony and wonky neck and no crop issues to the feel.