One thing I think might help, buy a 1/4 inch with guide presser foot for your machine. Thank way, your grandaughter won't have to be so concerned about a 1/4 inch seam. It will happen automatically when she puts the fabric up to the guide,all she will have to do is keep the fabric next to the guide and just sew. I have a 1/4 inch presser foot with guide for al my sewing machines. Just a thought!