Carla, please tell your friend this: My LAQ told me that it is completely normal to get between 1/4 and 1/2" of inward curve (hourglass) in the middle sections of large quilts. You can be the most exacting person and get everything accurate and it will still happen. It has something to do with the build up effect of all that piecing having less of a total effect on the corners of the quilt. She told me that almost all quilts come in with some amount of variation. Once she quilted it and I put the binding on it wasn't noticeable.