Houston, we have a problem.
Is she a Leghorn? It sounds like it could be egg yolk peritonitis. Do you have an avian vet? Was it you who has had chooks with hormone implants in the past, or was that someone else? Chickie’s Suprelorin implant has definitely made her stop laying; we’re now just waiting to see whether she has low-grade peritonitis from egg products in her system or something else. I hope Dorothy gets better soon.