It is hard when our mothers critize us because we so want to please them. Just remember this, even though important, your mother's opinion is just that. It is your work and if she doesn't like it just don't show it to her or tell her about it. If you want to be nasty you could remind her of all the tops she has done but hasn't completed a quilt. Maybe then she will keep her opinions to herself. I am sure that your family and friends appreciate your hard work and are very happy to recieve a quilt from you. Keep quilting.