If you called my MD's office and spoke w/ the nurse (me) I would tell you it sounds like she has a stomach virus.
NO SOLIDS until she has gone 4 hours w/o any vomiting. For liquids she can have water, 7Up, Gatorade, Pedialyte, water, water, water, ice chips, Popsicles and the heavy syrup from fruit cocktail (given on a spoon, in small amounts, it can settle stomachs)
After 4 hours she can have soup, jello, crackers, applesauce and bananas. Slowly move forward from there. Anytime she vomits you go back to clear liquids and restart the 4 hour time frame.
NO DAIRY NO DAIRY NO DAIRY until she has gone 24 hours w/o vomiting.
She should have a wet diaper every 10-12 hours and her mouth should be moist. A Child who is able to play, get around etc... is not dehydrated.
If the vomiting lasts longer than 36 hours she needs to be seen.
D.