One of my hens just laid an egg in the run. It was soft shelled and her with 3 others ate it after it dropped. I found half a shell in the coop about 2 weeks ago. The egg was eaten and just half a shell left. I’m assuming it was hers. I checked her after she laid the egg in the run and her bottom is really red. I sprayed vetericyn on her and gave her a thorough physical check. She looks fine everywhere else. What could be going on?