What part of VA is she coming from? I can only think of a few areas of VA where she might have to pay a toll before getting onto I-95, and even then there are ways around those tolls.
Otherwise, there won't be any tolls until she got down to Orlando, and even then that's if she decided to take the bypasses around the city. If she took I-4 straight through then I'm pretty sure there wouldn't be any tolls.