Daughter is sick with the stomach virus and can't even keep liquids down. What should I do?

Offer small portions. There are different causes for vomiting. Obviously viral gastroenteritis is among the more common reasons. If not kept hydrated with oral electrolyte fluids, this can lead to dehydration. Try pedialyte popsicles, or offer one spoonful at a time; or try electrolyte solution given with a water pistol. The secret is small portions. However, if this proves unsuccessful as well, you need to see md.