A.L.
If she is a music or online game lover, you can't go wrong with an iTunes or Amazon gift card. Also, a gift certificate or an IOU for her favorite place to go--a nail salon, the bowling alley, movie tickets, escape room, ... I think that kind of money towards an experience she would enjoy with a friend is different from just money or a gift card. For an actual gift, I agree with the others about asking her what she wants. Enjoy the process!