Odds are good that whatever she decides, she will end up changing her mind anyway. Virtually no one I went to school with is still doing what they started out in school for. A few are, but the majority spent a few years working (or trying to work) in their chosen fields before finding something that grabbed their 'adult' interest.
Personally I 'wasted' my talent and school years (according to my dad) studying technical theatre. 10 years later I make visual effects software. I use the lessons I learned in school every day, just not the way I expected at the time.
So don't sweat it. She will likely land in the right place for her eventually.