I think the best strategy is to let your HS kid be a HS kid. So that means on Monday she wants to become an Economist because she read a speech by Janet Yellen and thinks it’s the coolest thing ever, and on Tuesday she wants to study primates because she read an article about how a team of sociologists and anthropologists and linguists have teamed up to understand how infant monkeys learn to communicate with their mothers.
The nice thing about HS is that it’s low commitment! Nobody is going to force her to stick with econ once she discovers primates, and nobody will force her to stick with primates once she discovers her next great passion.
She’ll figure it out. I think if you read about (and meet, or watch an interview) with successful adult artists in whatever field or medium they have one thing in common- a total and absorbing passion in their art to the exclusion of everything else. And your D is lucky- she has figured out early on that this is NOT the way her brain operates, and that she’s got lots of things she’s interested in. Which is great!
My company just hired someone who was a Chopin competition finalist, graduated from one of the top conservatories in the world, and had an early career on the soloist circuit at some of the finest concert halls. He realized at some point that he didn’t have the passion to do his music full time, for the rest of his life, to the exclusion of everything else- so he went back to college and is now working in corporate strategic planning.
Your D has a jump on him! So you have nothing to salvage- she is talented in art, she’s talented in academics, she’s going to explore various interests before she decides what she wants to do and who she wants to be. You are in an enviable position!!!