My Pekin/Campbell duck was not acting very normal this morning. Typically, she is always quacking like crazy as soon as she sees me. This morning, not so much. Then when I let them out, she wasn't that interested in the pool which is really strange because she is normally first one in every day. She finally did get in, but really wasn't as into it. She has been laying normal eggs, one a day. She is 4. Also, this morning in her run I found a "fart" egg, that had a typical yolk but a very soft shell. The shell itself was broken, just the yolk/whites were laying on the ground. I have never found a fart egg before, so thought it was strange. She is an awesome layer, an egg every single day when she has light. Should I be worried? She has access to oyster shells/grit at all times. Thanks!