Half halts coming into the fence, you want all that energy, but then to contain it, so you need to be pushing on but then half halt to bring her back a little.
Think of it like coiling up a spring, you are gently compressing a spring between your hands and legs, when you release the front end you are allowing all that energy to spring forward over the jump. Even if she is rushing, unless you harness and hold the energy you can't get a nice pop over.
As others have said don't look down, (my worst fault of many faults I have
). Also when you are jumping think more about folding your body rather than leaning forward or two point, it stops the butt popping up into the air, most people put to much effort into very athletic poses, but actually your job over the jump is to be as little interference as you can be. Practice on the flat folding forward from your hips and looking straight forward, feels very odd when done right