I figured out he missing puzzle piece to my egg mystery. Turns out I was correct! Shasta was growling at me and I lifted her up and found Pebble's egg! I am pretty sure Shasta has been sitting there for the whole day because when I collected the egg, it felt like she just laid it. I am just glad to find an egg. All you have to do to stop a broody hen you just have to remove her from the nest and collect the egg and she will figure out that; why am I sitting here! I just hope to find that Shasta lays an egg by tomorrow and doesn't just sit there warming up Pebbles's egg!