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My name isXXXXX and hopefully I can help you out with this. One of the best ways to check is to open her mouth and see if she has anything stuck. Blood usually accompanies a tongue that has been bitten and I assume you would have put that in your message if she has.
A couple of other things can make dogs act like this. If she happened to get a hold of something bitter or something that is making her nauseous, she could be licking and salivating. I have also seen dogs who have severe dental disease like their lips a lot.
Look in her mouth if she will let you and let me know what you find
I probably wouldn't get too worked up over it. I'm gonna bet she just got a taste of something that didn't agree with her. I can't think of any immediately life-threatening problems that manifest as this so I think you should be ok overnight. She begins to act strangely...breathing funny or being lethargic then it may be worthwhile to take her in, but I would rest easy
So you don't think it's anything neurological?