To be honest, that discoloration on her dorsal area look more to me like she had some runny stool & managed to smear some on herself. Did you look in her hides? (on the "walls & ceiling")
She's a beautiful snake, btw...even if she did get "dirty".
Another thing: When you want to know what something like that is, the first thing you do is take a soft damp cloth & try to gently wipe it off, see? "Lint" & substrate & snake poo all washes off.
I could be wrong, but that doesn't look like a skin infection or burn to me...but we're not in a position to tell, only you are, by first seeing if it comes right off with gentle washing.
I agree with Armiyana that if it was a burn it would usually be on the ventral (tummy) side, though not always (as when using overhead heat devices).
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