According to the vet, as there were no other signs of an RI (no mucous in the mouth or nose, good color in the mouth, no audible wheezing/noises). Plus, she was eating fine and all other behavior was normal along with the fact that I had changed her bedding to Reptile Prime two months ago when I started to notice her odd collection of symptoms, he came to the conclusion that something (dust, fibre, etc.) in reptile prime was irritating her nose which was causing the other RI-like symptoms and the burrowing. Other possible illnesses were ruled out with a stool sample test.
As there is no way to confirm allergies in snakes like there is in humans (as far as I know) I'm assuming that this was an educated guess but hey, that's what I pay him for.
And she's doing fine now. Haven't had any further symptoms since switching the bedding back. Still keeping an eye on her but she seems alright for now.