Dear madam, Dizziness can be caused by a myriad of things. It can be due to a pertubation in the structures in the body that help us know our position in space and stand upright (what is refered to as postion sense) or may be due to pertubation in blood flow in the body or when the total amount of fluids in our body drops for example as a result to repeated fluid loss through vomiting or watery stools. Toxins released by bugs when they get into the body or some subtances the body releases to fight bugs or their toxins can also case affect our nervous system, blood vessels or other organs and cause dizziness. Your daughter may have had food poisoning or some allergic reaction from something she ate which may be the cause of vomiting and resulting diziness due to body fluid loss, the reason she feels better when she takes fluids. As such give her lots of fluids especially natural fruit juices and oral rehydration solution. If the symptoms persist in next few hours please go see a doctor. Hope this helps. Wish her quick recovery.