Lennoncham
Chameleon Enthusiast
Now that I see your set up I agree with Lennoncham, I don't think they are burns anymore. You did not mention that she was "falling a lot" in your original post. I went back and took a second look at the pics of your chams spine and those look just like my male veiled fell and injured his crest. See pics below. Your cham most likely hit her spine on something on her way down while falling. that would explain why the tips are not burnt but it looks like something got under her spine and ripped a bit of it up. I think an impact could make those types of wounds.
I might be the guy Lennoncham was thinking of...
Oh yes I remember that as well but there was someone else that had a Cham with the whole spine part coming off like the op's