It's hard to tell at this 'distance' but those appear to be scraped areas. While I can't rule out burns, it seems likely that she tried climbing around/under the CHE cage, perhaps scraping off her skin in the process?
Because that is such a large area that is exposed & at risk of infection, you should see a vet for treating this injury, IMO. (She might need an antibiotic.)
If you need to find a local qualified herp vet, this may help: https://arav.site-ym.com/search/custom.asp?id=3661
In the meantime, I'd suggest buying some Vetericyn antiseptic ointment (for reptile use) & applying it on the damaged areas.
I'd also change out her substrate to white paper towels to minimize infection for as long as she needs to get healed. It's a good thing she's a good eater, as she'll be shedding more frequently to heal, & she'll need to be well-fed. (When snakes are injured, they don't just shed the injured areas, they shed their whole body.)
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