Sounds like the egg is lodged in the vent and can't make it out. If you have a vet who will see chickens and don't mind taking her in, that's the best option. The egg may have to be broken to get it out - that's what I had to do with my hen - but it's best handled by a vet because you don't want to rupture anything inside and you have to get all the shell out.
I don't think there's any point at which there's nothing you can do - as a last ditch effort, you can always break the egg and get it out.
Keep us posted on what the vet does.
I don't think there's any point at which there's nothing you can do - as a last ditch effort, you can always break the egg and get it out.
Keep us posted on what the vet does.