Its going to take her years and years to do a front kick off the ground well. A jump kick takes away all the launching, pulling, and balancing she would have to do with the base leg.Technicalities. You still have to learn how to stand before you can learn how to fly. A jump front kick is just a front kick in the air. If you don't know how to do a regular front kick properly, you won't be able to do a jump front kick properly either.
Sean