Start with the basics. Using the rotary cutter to make straight, accurate cuts. Getting the cuts on the straight grain. How to read the pattern. Hopefully she knows how to use her sewing machine. Maybe start with a simple 4 patch in a lap size. She will need to know to buy 100% cotton fabrics, best quality she can afford. Show her how to press without stretching her fabrics.
You have made some really beautiful quilts, I'm sure that you will do a great job in teaching her!!