It could also be a sign of overheating.
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Sounds like it could be an upset tummy, or something going on in her mouth.
I hope she has been better today as well..... she seemed okay this morning, but I'm at work during the day and not sure if she is drooling or not, I will find out when I get home this afternoon..... at any rate, Leo has a scheduled appt with the vet today and I will be taking her with and mention her issue to the vet and see what he says.