Are ya sure its not the beginning of a RI? Sounds like that or a possible forign body could by stuck in her mouth. Im sure ya checked, but I have to ask...Did ya check inside her mouth to see whats going on? Drooling....ive only seen a snake do that after eating? Sorry Im not much help. I tried. Im sure someone here will help and if not, ill talk to one of the vets I work with tomorrow.
Anyhow, are the mites gone yet?
Don't waste your time.....EMBRACE IT!!
And then you'll know yourself....