Re: What is the proper ski and rope set up?
Everyone has a weak side which is generally the opposite of your forward foot. It is just mentally harder to cut that way and takes practice to get over.
I don't suppose you or your daughter ride motorcycles? I learned an important lesson from riding that applies to skiing: look where you want to go, not where you're going. As she is making her cut her eyes should already be at the opposite end of the wake toward the buoy, real or imaginary. Her head should also be fully turned in the new direction which will get her shoulders and hips to set up and follow.
It's hard to get over the jitters of slicing through the wake with your face a foot above the water, but looking across helps! As said above, cutting through the wake drastically reduces its impact. Unlocking the knees and loosening the hips allows the body to absorb that impact almost without noticing. The entire lower body acts as a spring with the sole purpose of keeping the upper body 100% stable.