I thought of appendicits, which left untreated can be extremely dangerous, but you said she had cramping, and with appendicitis it is more of a sharp moving
pain between the
navel and right side. If not for the cramping, I would lean towards a virus, but not with the cramping. The Gatorade is excellent for replenishing her electrolytes and potassium, but orange juice is even better. Keep us posted as to how she is doing, I have a 37 year old daughter and I tend to worry too much about her.