Love, The Equestrians

I really want to get more serious with Miki. Jumping is so much fun and I just get the feeling that with my new found confidence, we could go bigger than two foot. easy. She tucks beautifully and is so interested as the jumps get bigger. but first, i want to improve her on the flat. I want to get her to get more, airy and light. More floaty, more responsive and sensitive to my aids on the flat first. Any suggestions?