You need to find out what angle she was working in, then draw a line across the batting in that angle , maybe every 10-15" then start placing your strips at that angle, remembering not to sew all the way to the edges(1/2 inch or so). then trim off the left over material that hangs over the edge. You do one that has the highest side on the right, then one that has left side as highest side. Did I sound clear or rambling. I hope I helped.