Sometimes it doesn't become hard enough to demand study skills until graduate school. And then, I can name one person (my PG sib) for whom even a STEM doctorate wasn't enough challenge. This doesn't mean that there is no way to learn executive functions, though, as others have mentioned. Everyone will have to work hard and be self-reflective about something at some point. It's convenient that school does it for most people, but we're not talking about most people here.
I would agree: find an open-ended topic, project, or field about which she is passionate, where there is always more to get out of it, when you choose to put more into it.
