Our female has had a huge gut since we got her last year and it was only this year she laid infertile eggs. The female dragons are in general, tubbier than the males. I doubt she's gravid, but you would would have a good hint if she was if she runs all over the place, tries to dig into anything and everything, acts like a spaz, like I hear most gravid girls do, and which is what ours did too.
They are rather chubby lizards to begin with, and females are just fatter than males most of the time, so considering ours, even after laying eggs, still looks a little fat, your might just be a chubby dragon!