My sister has a 2-1/2 yr old EE who has been going downhill the past few days. She waddles like a penguin, and when she sits, she looks more like an owl than a chicken. Walking is unstable, falls a lot (fell down the whole ramp today). She eats and drinks but stopped laying. She doesn't appear to be egg-bound - can't feel any egg buildup. Anyone have any thoughts or suggestions?