Female dragons will raise folicles upon sexual maturity from seasonal cycling or even visual stimulation or buddy prompting (that is a female friend who is ovulating in her cage) if the dragon is not inseminated ...has raised folicles she will lay infertile eggs.
Laying infertile eggs is extremely taxing on a female dragon much more so than laying fertile eggs..a female takes much longer to recover after laying an infertile clutch and it is sometimes harder to get a good cover after an infertile clutch is laid. Unlike a chicken, it can be dangerous and is not normal for a female to lay infertile clutches and there is a big, big risk of sac burst as the egg is jelly like and the muscles that line the deposit canal are incredibly strong. Infertile eggs are soft, ill shaped sacs containing albumin and are harder to pass than a firm, fertile egg....the risk for peritonitis is high and a dragon that lays more than one clutch of infertiles usually struggles to regain weight and appetite.
Dragons laying fertile clutches have a good bloom directly after laying and feed promptly and ravenously..they only lose the extreme roundness to their belly but should have great body condtion right after laying if they are healthy and properly managed during brooding.
Yes, it is possible to get a cover on her, but she might not take right off..it is best for the dragon to avoid laying infertile clutches, you can do this by resisting folicle production by habitat or by breeding her...hard if you dont have males, but many people have non breeding pet females ..they do not brumate them to push their reproductive hormones into work and they will try to discourage a self brumation..this helps the female to stay healthy as a non breeding pet. Also spaying the dragon is an option..it sounds frightening and terribly uncommon, but it is very easily done, small incision, no stitches, the dragons eat a few hours later like nothing ever happened. It is not so popular because many people do not wish to spend the money to alter a reptile and it just sounds plain weird. There may not be many specialists in every state, but we have a few in FL and a really good one in NJ.
Yes, she can lay another to several more infertile clutches. It might be a good idea to try and get her inseminated and ward off another infertile laying.
Consider contacting a knowledgeable breeder or vet who is very experienced with female reproduction, they can walk you through some steps to keep your dragon healthy and try to reduce the stress of laying infertile eggs with some habitat and special care tips.
Good luck! Keep your eye on her and take extra special care of her...a bit of Blue Green Algae sprinkled on her food twice a week during this will help her greatly. Hope all goes well