Curious indeed. I have had my female for about a year and 3 or so odd months... and she mated immediately with my male and laid 3 near perfect clutches last season. She has already laid one infertile clutch this year, and just recently laid a fertile clutch of 9 eggs... 4 shy of last years average. She was Brumated "naturally" in my basement which gets to about 55-60 degrees in winter with the lights off, and about 75-80 with the lights on. She slept for about 90% of her day, along with the male, only getting up for water, food, or poop. =) By the way, Brumation should take place during the winter months wherever you live, or between November to February/March, gradually changing the temperature day by day to cool down, then again to warm up.
So, the question here is did you brumate your dragon? In some cases, a female may not produce eggs because of a lack of this cool down period, but other factors may be influencing her decision to not make eggs. Your feeding choices may also affect her ability to produce eggs, I would expect after 2 years of having dragons that you know what to feed them by now for a proper balanced diet.
Post what you feed them on a daily basis, along with some of your other care practices like their cage size, temperature and substrate. While not the end all be all of reptile care, those three things may have a great deal of influence on the productivity of your female.... and the males she has been housed with.