When my daughter got her license I thought she deserved a little gift, so I got her a garmin nuvi for her car. She really loved it... untill the day she returned from a trip to see her boyfriend in College. The neat thing about that garmin is it keeps track of a whole lot of data, including miles traveled etc etc. It also records top speed, and hers happened to be 105mph on that trip. She was the same as your daughter, good girl, sensible, great grades, but unfortunately she got my "need for speed" gene. We had alittle talk and never saw that top speed above 70 again.
Good Luck, Craig