Maybe try to arrange for her to interview people working in the various fields she thinks she may be interested in to help get a feel for what they do beyond the classroom.
My DD20 was 100% certain she wanted to be a Middle School History Teacher at 15, after 1 year of college she wanted to be a School Counselor. She is about to graduate with a Criminal Justice degree and will go straight to grad school for Criminal Justice.
I had no clue what I wanted to do at 15. What really helped me was being told the percentage of people who don't end up in the field they got their bachelors degree in. That took the pressure off and allowed me to try different things. Despite being gifted, my career profile suggested my ideal career path was to be a roofer(!) I decided I better pick something before someone else picked for me so I pursued Animation/music. Then Law (pre-law), followed by sociology, then Child Development. I ended up with a graduate degree in Public Administration but specialized in planning and legal issues/administrative law. None of it was wasted, I have been able to use everything I learned along the way in my career as an Urban Planner.
My DD15 has no idea, she's batted around neuroscience, astrophysics, law, philosophy/classical studies, cooking! My advice to her is to enjoy stretching her brain in college and not feel like a decision right now will lock her in to a lifetime career. Why put that pressure on them?
I realize some of those fields might require many years of study but what's the point of jumping the gun and taking off running in what may turn out to be the wrong direction?
Just my humble 2 cents...
