I think internal laying is when the yolk misses the infundibulum and drops into their belly. I do not think it would pass. She could be breaking and egg inside of her, or because of the heat she just missed getting all the parts together correctly. I had one chicken do that when she got walloped accidentally. Did your hen fall or get squashed in a closing run or coop door? Keep an eye on if she is laying. If you get the scrambled egg look and an egg, then we can at least rule out egg issues. I hope she gets to feeling better soon.