You should easily be able to set up the camper in a forest service or park service campground and get a ride to and from each day for 2-3 days or maybe more -- depends how long she wants to drive. The reality is that it takes us all day to walk what can be driven in maybe twenty minutes at highway speeds, so even accounting for back roads and the twists and turns going from one trail crossing to the other, she won't be driving all that long much of the time. (Yeah, sometimes it'll be tough -- the Smokies, for example, when you really won't be able to get off the trail every night.)
Also, what a wonderful gift to you.