I think this goes without saying.. but i'll say it anyways! Lol!:
When you start to teach her leg cues.. I would recommend working with the rein and the leg. For example.. you want to turn left.
First, apply your right leg, and hold it against her side, then after a very brief moment, pull the left rein to start the turn.
So long as you are consistent with this, she will pick it up. She will learn that every time you lay, and hold your leg on her, you want her to move away from it. Eventually, the rein cue will be very minimal.
A good way to practice this, is just lots of walking and circling jumps set up in your arena. That's how I always taught the horses I trained. They were tuned into me, since they didnt know which jump they would circle next, and they were anticipating and waiting for the cue to turn.
Be consistent, don't rush her, and she will totally pick it up in no time!
This is just my opinion though, its worked for me in the past with every single horse I've broke to ride, so I wanted to share! =)