Since this is her first clutch, I suspect the second egg is unusually large and infertile. If she is eating, I wouldn't worry too much just yet. If she is not eating and her tail is starting to look a shriveled, she may not be able to pass it without aspirating it.
Quick update. All is wel. Has eaten every other night like clockwork. And tail is getting fatter. Was going to put her bf back with her sat but haven't yet. Will tonight likely after they eat. She's doing much better. So glad the egg passed. Don't know what I woulda done if it hadn't.