I found an egg in our duck pen a few weeks ago... it wasn't waxy at all, certainly chalky, a bit rough... so i assumed a chicken snuck in and laid it... now, one of our ducks has been injured, and she is in isolation. locked in a dog crate, no way anything can get in or out... she's a khaki campbell, and was born last may. This morning, there is a chalky, sandy, white egg in there with her... does this mean that something ELSE is wrong with her?