To be honest, if she's twitching and has a 'swollen throat' as you say- It sounds like hypocalcaemia/metabolic bone disease to me.
Calcium has many vital functions in an animal- one of the most well known is its requirement for good bone growth. When there is insufficient calcium in the diet, especially for young growing animals, there is insufficient calcium to add to the bones to make them stronger, and to worsen it, the animal produces more parathyroid hormone which stimulataes the resorption of what calcium is in the bones (i.e.- removes the calcium from the bones) to be used for vital processes within the body. These lead to the bones becoming less mineralised, and the body replaces the calcium with a fibrous type tissue which is actually more rubbery, not as strong, and occupies more space- this is why animals with hypocalcaemia/metabolic bone disease have rubbery bones, especially the lower jaw, and why they have abnormally shaped bones including bulges in certain areas, in this case around the neck area. Radiographs can be useful to help diagnose this, because these bones show up much paler on radiographs, due to their lack of calcium/mineralisation, which makes them appear much whiter on the x-ray. As more calcium is lost, and more fibrous tissue replaces it, the bones appear 'blacker' and more like the soft tissues and fluid of the animal. Another vital use of calcium in the body is in the function of muscle cells. Calcium is actually essential to allow muscles to relax, and if it is not present to bind to specific sites on the muscle, the muscle cannot relax properly- you end up with neuromuscular signs including tremoring and twitching because of this. You can get other problems, such as cloacal prolapse, paralysis and in adults you can end up with seizures, amongst other things. Animals with hypocalcaemia/metabolic bone disease are also prone to fractures, and multiple fractures may be seen on x-rays.
Note- this is an extremely simplified version of what happens in animals with hypoglycaemia, but hopefully you get the idea.
In summary- to me it sounds like this lizard has severe hypocalcaemia and requires veterinary attention. A veterinarian (with at least some knowledge of reptiles) should assess the animal, and probably administer an appropriate volume of calcium gluconate as an injection, and the animal may need a series of these injections, in addition to the UVB and oral calcium supplements, to get the animal stabilised. Any severe bone deformities may very well stay with the animal for the rest of its life. If you don't know of a reptile veterinarian, you can just go to a local trusted veterinarian and request that they call a reptile specialist, or even a place like Currumbin Wildlife Hospital. I've done some of my vet science placement at the Currumbin Hospital and they are great people and very willing to help people.
