Ack. My first hatching attempt went bad. I had issues with the other hens jumping into the broody's nest cause I didn't realize I needed to barricade her off, I accidentally tossed her first batch a week into her setting, then my dog got into the coop and had a snack of her half developed eggs, and the two or three that did hatch didn't make it. It was a real nightmare. Anyway, fast forward to a couple weeks ago, I thought I had another broody, she had been sleeping on a clutch of eggs. So I picked through and chose the quality looking eggs to leave and marked them, and waited to see if she was going to be in for the long haul. Well, she wasn't. So yesterday I went to collect the old eggs to feed my pigs and was shocked to discover my original mama chicken had adopted the nest, and she is committed. Growling and puffy and glued to the nest. I again carefully picked out some good fresh eggs and marked them, and went to swap them out for the old ones. (which I figured had gone bad) Before I did that though, I candled them. These eggs have some obvious development, 2/3 of the egg is dark. I don't know what to do now. I don't know if the chicks inside are live, or what's going on. I meant to isolate her to protect the eggs and her nest, but I don't know if I should leave the eggs she's setting on with her, or start over with fresh eggs. I suck at this.