My wife is a good driver. She is now at a point she can drive 38 off.
A friend of mine's wife is a great driver and I ask him the process he said be patient it will be worth it in the end. He was right. Remember her stress level will be high...pulling the skier up, counter steering, the power of the boat, stopping at the end of the lake, not running over the skier, not hitting buoys, boat centered in the course....we all started at that same point.
Break it down to small pieces learning/being comfortable with each stress point. I would wait on sure path as a fine tune tool when she is driving comfortably.