Hi there....that's an egg. She should have a lay box, she is agitated + needs to lay. Some dragons will eventually just scatter them around the tank, but they can become eggbound if they don't have what they consider to be a good laying site, so it's bet to make up a laying box. You'll find all you need to need in the breeding forum here on this site, there's a sticky thread at the top that is an excellent tutorial for when your dragon is about to lay .