Please answer me! ....my 17 months old granddaughter has a high fever and vomiting ...wat do i do?

Calm down and then..: You sound panicked, so take a deep breath. Most likely she has "stomach flu" but no way i can tell for sure. Fever is how our bodies fight infection & is not dangerous unless above 105. The greatest danger is dehydration. Ideally give her sips of ginger tea with lemon & honey (or ginger ale) for the nausea & to hydrate. If she can't keep fluids down for several hours go to the er for IV fluids.