Your beardie definitely sounds like it has MBD. Go to this website to learn about it. Then answer the questions at the bottom of this post.
http://www.beautifuldragons.503xtreme.com/MBD.html
Here's an excerpt:
"Signs of metabolic bone disease include hard knobs in the long bones of the legs, bumps along the vertebral column of the back and tail, and softening or hard swelling of the lower jaw. Regular physical exams are important as these bumps may be felt before they can usually be seen. Visible signs of moderate to severe MBD include jerky movements when walking, repeated tremors, twitches, or spasms in the limbs and muscles of the legs and toes when at rest or after exercise, and shakiness when being held. More advanced cases of MBD include all the above signs plus constipation, anorexia, and fractured bones. Severely deficient Beardies tend to be lethargic and may only be able to drag themselves along the ground.
There are several treatment options available for Beardies suffering from MBD. Moderate to severe cases of MBD require the proper diet, temperatures, and UVB as well as a more powerful calcium supplement than those found in pet stores. Oral administration of calcium glubionate (NeoCalglucon®, 1cc/kg) or injections of calcium lactate (Calphosan, 250 mg/kg) or calcium gluconate (100 mg/kg) are generally prescribed by veterinarians. Studies have shown a faster recovery with calcitonin (Calcimar, Miacalcin, 50 IU/kg in the front leg, repeated once a week for two weeks) when it is administered to Beardies who have a normal serum calcium level. A blood test by your vet will determine your Beardies serum calcium level. The use of calcitonin before normal levels have been established, may cause hypocalcemic tetany and death. In mild cases of MBD, where the signs are felt or just barely visible, can be treated by correcting the diet and environment."
Please answer the questions below so we can learn more about her.
What size tank is she in?
What substrate is on the floor?
What UVB does she have?
How far from the UVB can she get?
What is the temp of her basking spot?
Temp of the cool side?
What do you use for a thermometer? stick-on, temp gun, digital with probe on a wire?
What are you offering her for food? Be specific.
Are you gutloading your feeders?
What kind of calcium & vitamins do you use and how often?
How often & how do you soak her?