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She may consume ginger ale provided the vomit is not sour or acidic. Then, only plain glucose/sugar drink will be suitable.
In between sugary sips, she also may consume lemonade, soda etc.
Mostly she must be having digestive upset, which is self curing if solid food is withheld for half a day or so.
Viral attack usually has some fever, moderate pain etc.
Food poisoning entails more than one member of family being affected.