Hi. My duck has laid soft eggs for going on three years. Her first year she laid regular eggs consistently from August through to the next July. She molted then and since has given me soft shelled eggs with no yolk. She's a khaki Campbell. Her belly hangs quite low. I have a hen and drake Indian runners. The drake mounts both hens. I get normal eggs from the runner. They are fed layer pellets and I have Oystershell available to them but it doesn't get used much. Any ideas?