One thing I would do opposite to what you are doing right now, especially since she is young, is to ride her on a loose rein for MOST of the time, not with tight reins. That can make especially young horses feel claustrophobic, and honestly, I wouldn't worry about a frame or riding with contact for quite some time.
Practice getting her to move off your slightest suggestion, either from your focus, seat, or legs. Take a lot of "passenger lessons" on her, for your benefit as well as hers. Again, do all this on a loose rein. Make a game out of it. Tell her "Don't make me use my reins," as in, say you want her to turn left. The sequence of the game would be you look left, turn your belly button left, add a little leg, then gently use your rein to direct her, then when she turns release the rein completely. Go through the sequence slow so that she can really connect each "phase." Soon all you would have to do is LOOK left and she will turn. The natural power of focus is really powerful if you work on it.