It looks like the basic checklist when suspecting a possible calcium deficiency has already been covered, but I just wanted to add, that what supplements you're using might have an effect as well. You want to make sure you're buying them from a good brand, and of course that they contain D3 to allow proper calcium absorption. I know I have heard of some people trying to use supplements developed for other species (birds, for example) or going for cheap supplements from odd sources.
Another something to consider is what exactly you're feeding your beardie. One of the main reasons dark, leafy greens like collard, mustard, turnip, escarole, etc. are recommended is because of their high calcium content (they're good for people too!) and nutritional value. If you're using lettuces, you're basically giving your dragon crunchy water, with no nutritional value; the risk of dehydration is lower, but diarrhea and malnutrition will likely result. Another concern is spinach; spinach is not recommended for most reptiles because it contains a high amount of oxalic acid, which will bind with the calcium it provides, resulting in very low calcium absorption rates. Oxalic acid is the reason why we do not eat the leaves of the rhubarb plant; in high enough concentrations, it is toxic.
Hope you get it all sorted out soon! I definitely would not hesitate to make a vet appointment as soon as possible.
