Hello. Welcome to Just Answer and thank you for the question.
I am Dr. Sohaib, a Medical Internist (who deals with diseases of all the organ systems of body) and i will do my best to find an answer for you.
Ideally she should be taken to ER for intravenous rehydration, and iv drugs to bring this under control.
At home, following measures will help.
Dramamine available over the counter to control nausea.
Small frequent sips of liquids instead of whole glass full at one time.
And observe her. If she becomes dehydrated, drowsy, lethargic or weak, go to ER.
Wish you good luck.
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I would have been worried too if i were at your place but let me reassure you that this is a treatable condition and carry a good prognosis with appropriate management.