How do I cure Gastric Flu?

If she is throwing up and has diarrhea she may be weak due to dehydration. She needs lots of fluids and not eat a heavy food. She needs food that is easy to digest, like broth or a light soup and some toast, maybe some Jello. Plenty of rest is good. If she isn't feeling better in a few days she should see a doctor. Most cases of what people think is gastric flu is actually food poisoning of some sort. Hope she feels better soon! Oh yeah, look at her tongue and if it has ridges around the edges it means she is dehydrated and needs to drink more. You may have to wake her once and awhile to take in fluids. Can you get her some vitamin water?