I agree with those that say let her work with the easiest of patterns. It will come in time. I'm sewing after 45 years and still find the time to go off track every now and then. The "scant" 1/4 seam still drives me bonkers. How about letting her make a simple tunic top that is just straight seams and see the joy she'll have when finished. If she veers off on a seam then it will pull apart and I would guess she'd see how important it is to keep the seams straight. There are some folks that just weren't meant to sew/quilt even if they want to do it badly. I would love to do decorative cake decorating, but after a number of tries I have decided it wasn't meant to be so I don't do it. The blue painter's tape idea is a great one. Good luck to both of you.