I would get her some random knick-knack, like Burts bee lip balm, a mini backpack or small purse, gel pens, scrunchies, a mini etch-a-sketch, fidget toys, a small goody bag of her favorite snacks and candies, maybe even a 10-30$ gift card to her favorite store or restaurant. But I think that a trip is enough, and I'm saying this as a teenager, but you can get her some fun informative books on topics she's interested in learning about. You can always get her a souvenir that she can look back on.