What about getting her a pair of glasses with clip-on sunglasses? They used to look somewhat unattractive, but, nowadays, many of the clip-on sunglasses are quite nice looking and very trendy. And, frankly, the clear with clipons are cheaper than transitions, and you can get them in darker shades; there are other problems with the transitions, as, in many cases, they do not "react" in the car or in rooms that have windows that have UV coating on them ... so, clipons give you that sunglass effect in those areas which the transitions may not.
We get two pairs of glasses for my kid: one with transitions, one without. She needs the transitions b/c she is farsighted; same heightened risk factor due to the index but not as severe as Falen's kid (yes, this is a legitimate problem; particuarly if the child is blue-eyed, oddly enough). However, in winter, we typically don't need the transitions in our area as the UV index is lower, and she's not a skiier. The one pair with transitions are in titanium frames as they are used for sports and outdoor activities; the ones without are pretty fashion-type frames. We can also get a clip on for those pretty ones if we want them - but, don't bother.