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I am sorry your kitten is ill. It is not parvo. Parvo is a virus that puppies get but does not typically cause GI signs (vomiting and diarrhea). Given her history, I would be more concerned about GI parasites causing the vomiting and diarrhea. There are also viral causes of diarrhea in kittens but this requires supportive care like hospitalization, fluids, or anti-nausea medication and with this she will either get better or not. If it has been going on for more than a week, I am more concerned about parasites. I recommend taking her to a vet so they can prescribe a dewormer for her. They can also give her medication to help her stop vomiting. There is nothing that can be given at home to such a young cat, all of the anti-nausea medications that would be used are prescription.
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