About 5 days ago my 8 month old barred rock hen’s waddle became lighter, so we didn’t think much of it. This morning, we found her limp in her legs, so we separated her in a spectate cage. When we checked her tonight she was dieing and laying down with her eyes closed. We didn’t feel an egg in her vent, but that had been the first time he had ever looked for that. What could this be? No other birds have any other symptoms. Please help!