Is she not tacking down stitch starts and stops? That would be my guess. I learned pressing to dark but when working with small/mini blocks you have to press open. Simply pressing to one side can be enough to make your block look completely off in those tiny blocks.
Like others, I'd be looking at tension setting and stitch length as well but my first question would be whether or not she tacks her line of stitching first and last. If she doesn't want to hear it, as others have mentioned, it's not worth your time and effort. She'll need to find a new quilter.