Good that you "removed the substrate"- paper towels are a good choice while snakes are healing, plus any bleeding or oozing shows up...always better to know.
I agree with dabbing some Betadine (aka Povidone-iodine). Neosporin (regular, NOT pain relief) can be used sparingly (it's petroleum based & can cause problems
with skin/shedding, but a BETTER choice is to order some Vetericyn- it's a water based topical antiseptic gel designed for use on snakes. (-local vet might carry it?)
If this gets worse, see your vet...she might need antibiotic injections...and if this injury is repeated, it can turn into a deeper infection that requires surgical removal;
if untreated, this can become a fairly serious health threat, since the infection is near the mouth, brain, eyes...important stuff.
Is it possible that her enclosure is too small? or unsuitable in some way? -what are the dimensions? what are the temperatures (hi & low)? It's more likely a male
snake that is restless to breed that behaves this way, so maybe there is something that needs to be changed to keep your pet happy & healthy?