I think the pp who advised her thinking about what she broadly wants from life is a good idea.
Does she want to earn a lot of money, does she want to spend most of her time outdoors, does she want to have the chance to travel with her job, does she want to learn and use a second language, does she want to work in an office, does she want to work with people, does she want to do something academic, does she want to help people, does she want to do some physical where she uses her hands?
One thing I wish I'd known when I was at uni was what careers were possible, my parents have very normal jobs and it never entered my head that i could have done architecture, interior design, quantity surveyor etc.
At the end of the day you can guide her but it's up to her to choose, and she doesnt have to go to uni.
One of my A Levels was in business studies and we did a module in marketing that I got pretty high marks in so I just kind of went with it and got a degree in it then worked as a marketing assistant and worked my way up, but it's not turned out to be as lucrative as I thought. I mean it pays alright but I'm not earning mega bucks and it doesnt challenge me.