It might not have occurred to her at this age. Even if it did, I don't think it would really make her happy. Twilight is a natural academic. She'd naturally gravitate toward some sort of science or engineering field. Given I consider magic to be an in-universe science, I can easily imagine her building magical devices instead of learning spells.



Now that's an idea: PegaTwi and the Apples vs the Flim Flam brothers in a magitech build-off.