This quilt will have special meaning and be a real treasure for your niece. I really like the idea of the embroidered copy of her art work. It got me thinking of other ways to do this. For those of us who don't embroider, the art work could be scanned then printed on the special fabric available for that purpose. Or maybe use fabric paints or markers to duplicate the art work.
That's one of the reasons I enjoy the pictures everyone shares here. They spark so many ideas. Thank you for sharing.