You are very strong. I don't know how I would survive without jumping....LOL.
Anyway, you two look great in the video. Rainy surely has potential. It will really be worth the wait and then when she is older, and after lots of dressage like meantioned in this thread, she will be even better.
It will be a great idea to work with poles. You can also practice the striding and all with the poles. Set up a jumping "course" with the poles only, and take Rainy over them at a canter, as if you were jumping, and practice lengthening and shortening her stride. When you come up to the jumps, it will be as if you are working with raised poles! (which is exactly what they are, LOL)
Just clench those teeth and wait for those days to fly by. ; )
*~ THE HORSE STOPPED WITH A JERK, AND THE JERK FELL OFF -- Jim Culleton ~*