Yes, the non-pain killing nepsporin is good. She will likely be fine, they tend to heal well from this kind of injury. Obviously, the basking light is too close and you need to move it away. Chameleons will base their temperature on what their internal temperature is, so despite the fact that the skin is getting hot enough to burn, their internal temperature is not as hot as they want, so they stay under it. Good luck with her. I'm sure she'll be OK.