Good idea using paper towels. Wow, you weren't kidding, that's one heckuva cut. I think she needs stitched, or maybe super-glued (?) to heal well.
I'm not sure what determines when/where glue can be used, but I know that it is sometimes used medically...but I'm NOT in any way suggesting
you do it yourself. I'd have used Neosporin ointment on it too, for now. (only the regular kind, never the "pain relief" version on snakes). I wouldn't
be surprised if the vet puts her on antibiotic too. Shedding will be a challenge for a while...DO get her in to a vet a.s.a.p., one experienced w/ reptiles.