Here's what I think she's done: Cut lightweight muslin strips in different widths; Using scraps stitch a piece down, then using the stitch & flip method, work your way down the whole strip; trim the front pieces to the width of the muslin strip. Lay a backing right side down on the table and lay a batting on top of that, then lay this first strip down either at one edge or in the middle. Make another muslin covered strip of scraps and then lay it face down on the first strip, and stitch it to the first one with a ¼" seam right through all layers so that you are quilting it as you go. Then open out that 2nd piece & smooth it flat and continue to make muslin covered strips & add them until the complete sandwich is covered. It might make it easier to start in the middle & then work out to both sides so that you don't have the whole quilt sandwich scrunched into the machine opening. Hope you can understand what I'm trying to explain.