Kingsnake has an RI :/

[aurum]

I'm not seeing your snake to know for sure if she really has an RI, but since the symptoms are so slight, it's certainly NOT an emergency, & I'd keep trying for your regular vet, if anything, for now.

Some snakes also make some little popping noises when a tiny bit of previously-shed skin remains in their nostrils. (FYI, snakes normally shed the skin in the outer part of their nostrils- & with some snakes, it just gets stuck.) I have a feeling yours is something like this, & she's not actually sick. I'm curious to see if she eats tomorrow...I hope so. King snakes are not prone to RI's the way BPs are, perhaps because they don't need the higher temps. that are harder for owners to maintain? And kings (in fact, most colubrids) are just more "forgiving" about humidity too.

As usual, she was very enthusiastic about feeding today and ate her hopper no problem. Based on what you've said and how normal she looks I might hold off on the vet for now and just continue monitoring her. I'm really confused about the saliva I saw though, if she is actually healthy what are the explanations for that?