If it won't come back out the top, it will have to go out the bottom. Was it a short round I hope?
My biggest concern would be metal poisoning, and any residue on it could also be bad.
Try to give her a higher than normal fiber diet to pass it quickly thru her system.
I don't think I ever recommended Metamucil for a chicken, but it may help this time.
It will bulk up like a gel, and also cushion her digestive lining from any sharp edges.
I would also recommend a can of whole kernel corn. It's like crack to them, she will prbably eat the whole can if allowed.
Plus it is high in fiber. Hopefully she will pig out, and poop it out.
Good luck on this one, I don't think this is gonna be easy.
Do you have access to get her x-rayed?
It will take a few shots to see if there is any progress thru her system, but you can monitor where it is and if it is moving.