My hen started acting funny last eve. She didn't come running for her evening treat that I give to call them in for the night. I had to go looking for her and found her under my brooding coop. Once I got her out she didn't seem as active as normal. I didn't think to much of it thinking that she was just sleepy or something. But this morning she seemed confused and somewhat lethargic. She also has a wet bottom. I'm still new to chickens and she is from my first bunch that we started with. I felt around her crop and underside to see if she felt different from the others. Her comb and waddles look normal her crop feels fine and her weight seems to be ok. However she does have a slightly swollen squishy abdomen. How do I tell if it's water belly, Egg peritonitis or impacted egg etc....?