Air National Guard hires you into a specific role. You pass and you are in that role, something prevents it and you can get out. That's a good guarantee for flying. She'll need to complete a degree first, although she may be able to apply while still in school.

I'm going to buck most here and recommend an aviation degree if she is going the full civilian route because of some of the advantages espoused here. There are other ways to do it, but if this is what she really wants, I think it's worth going that route if possible.