Hen lethargic, eyes shut, head movement side to side

[NikkiBrantley59]

Hello everyone,
I'm heartbroken that my year old buff orpington is very ill and I'd like some help please. 2 days ago, she was acting very withdrawn from my group of birds. She was just standing alone in the corner of the coop with her eyes closed. I figured she was sick so I separated her from the others. She is now worse. She doesn't seem to want to walk and when she does, it's not very well; She seems wobbly. She just lays on the floor and her head tilts from side-to-side very slowly. She keeps her head and neck drawn close to the body as it bobs from side to side. She doesn't want to eat or drink and she keeps her eyes shut very tightly. She seems dazed and unaware of what's going on around her. She was vaccinated as a chick so I don't think she has those diseases. None of the other chickens are sick so I don't think it is a highly contagious sickness we're dealing with. She has no other symptoms, but I think she is very ill and I want to help her as fast as I can. I will greatly appreciate any help and advice. Thank you.
Pic of my sick girl included

 

[davibirks]

Is it possible she’s egg bound?

 

[NikkiBrantley59]

Is it possible she’s egg bound?

I don't think so. She successfully laid an egg when she already had the symptoms. She didn't lay yesterday or today, but i thought that was decreasing egg production due to being sick.

 

[davibirks]

I’d do some checks to see if she’s egg bound personally.

 

[NikkiBrantley59]

I’d do some checks to see if she’s egg bound personally.

I just did the egg bound exam an I didn't feel anything. It felt like an empty cavity to me.

 

[ChickenQ]

I know this was few years ago now but I am wondering if you ever found out what was wrong with her? I have a chicken exhibiting the same symptoms.