Pilot, Andover is in my neck of the woods. It can be a difficult trip (most east coast travel is) but if your timing and the travel Gods are good it's not a big deal. We do the 287/87/84/90/495 route when we go back and forth to the south. Best bet is take I90 to 495N. Depending on what part of Andover she lives in, you either exit directly off 495 or take 495 to 93. Easiest access campground is probably the KOA in Littleton, MA. It's near 495 and at non-peak hours it's about a 30 minute run straight up the highway. From Andover it's a straight shot down I93 into Boston, but if you don't want to drive in the city you can take the train/MBTA in.