If I remember, some of the JrROTC programs award academy scholarships
to some of their leaders, she should push for that. (which means the politics of aspiring to be commander). And in any case, Academy = Officer = Leader. I'd have her start to look at books on being a leader: I'd be willing to be that those kinds of books are exactly in her interests, anyway.
Also, your congressmen can award some of the slots: so she should be writing her local congressmen (I can't remember if Rep or Senator- but I think Senators) now. Dropping a line every 6 months or so, ala - I want to be considered, how do I go about it - couldn't hurt. (Neither could volunteering for the congressmen - good suck up and good civics experience. - win/win).
If you want something, it doesn't hurt for the people who can give it to you to know it! She should be ingraining those people (subtly) with the thought that there is nobody else that wants it as bad as she does!
Hope it helps,