Hello,
Could you tell us a little more about your setup please? What type & brand of
UVB light are you using, is it a flourescent tube bulb or a compact or coil light? What type of basking light are you using, a bright white light or a colored light?
What are the temps in the tank, & what do you use to measure them with, a stick on thermometer, a digital probe or a temp gun?
Are you supplementing calcium?
Why do you have her housed with her brother though, they can inbreed? Please separate them as soon as you can. A 20 gallon is entirely too small even for 1 adult dragon, let alone 2 adult dragons. You need at least a 75 gallon for 1 adult.
If he is 3 times as large as she is, he has dominated her to the point of illness & her symptoms are classic metabolic bone disease.
What do you feed them?
Tracie