In my experience, celadons in general are more likely to have egg issues. They seem to need more calcium than the others, so I try to make sure that they have oyster or egg shell on the side available all the time.
I have had a couple of accidents when putting eggs into lockdown. I have noticed that eggs that get cracked while in lockdown may hatch, but every single time the chick has been stunted like this.
This could be something like that, it could be that this one is not getting as much food as the...
It was getting dark awfully early, and I was hearing distant thunder, so I decided to close up the greenhouse and coop the chickens up early tonight. It was just starting to get nasty when I got back into the house.
good luck. It is possible that with some nursing and treats she will recover, but it sounds like you are experienced enough to know that it may not. You have done what you can.
I missed the poop. That means she's not egg bound. In my experience, calcium is critical for buttons more than coturnix, but it varies from individual to individual, and might vary depending on the line.
Is a vet an option?
I forgot to ask how old she is. If she's over 3 years old, it could...
Are they getting regular calcium on the side? It sounds like she may be egg bound, in which case, she need treatment ASAP.
This would be easier to diagnose if you could tell me if she's laying or at least pooping.
Can you post pics?
What are you feeding them?
If you think she's egg bound...