I have a year and a half year old sex link hen that came to me free in a clutch of 5 chicks I bought. She lays eggs like nobody’s business and eats like a horse but she is a little frail thing. She never missed a day laying an egg but then she started molting and no eggs and I knew that was why and I was glad she could give her body a rest. So about a month ago I saw a tiny egg in the nest box and another one the next day then the next day a shellless egg and she has laid consistently every day and every egg has no shell or a very thin one. The yolk and white are there but no shell. I have checked her for a stuck egg nd she was ok there. She still eats like a horse, very active, still gets along well with the other hens (for some reason stopped laying period after they molted and that’s ok by me because they are pets to me, they seem fine too. Bright red combs, huge appetites, no mites and I have those mite control strips from myers hatchery on each side of their door. I have always kep oyster shell calcium in a a container in their run. I am clueless. So does anyone else have a theory on what could be going on?