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Hello. Welcome to JustAnswer. I am Dr Z. I'm reviewing your question now, and will post back with a reply ASAP.
I would be most suspicious of a possible gastroenteritis (inflammed GI tract) or pancreatitis. Also in small dogs, a bulging or ruptured verterbral disc and present with symptoms similar to this.
An examination and possible xray +/- blood work is definitely in order. I am glad you are taking her in.
You are welcome. Good luck with her.