I have done it both wyas. store bought and home made. It depends on time, resources, and colors available. Go with the prepackaged. If it doesn't last, get her to bring it back in a few years and replace the binding. There is a fairly wide binding that Wal Mart carries or use to carry--wider than bias tape and maybe you can find it. I don't use bias as a rule, usually tear strips of fabric--to get it on the straight of grain--use 2 inch strips doubled with wrong sides together. I do piece my strips on the bias since the seam is less noticable that way.Sew the binding to the back side of the quilt and that way when you flip it over to the right side you will have a nice folded edge and you can hand stitch it to the front. Good luck!