If you want to get her something cute, you can let her pick a fancy glucometer case from these folks (girls love stuff like this). We get a discount being tu members, look under About Us in the menu bar above, under discounts:
Or maybe a really pretty medic alert bracelet with beads and colors she can pick. This is also a place that gives us a tu discount:
Or maybe take her to a concert. She has been acting so grown up in taking care of herself that maybe you guys could go to a show together. My mom took me to see The Police (I am dating myself here) in the 80's as a reward for a job well done in school (this was before the D but it was my favorite concert to this day because I was with my mom).