Thank you for all the suggestions. Right now my thoughts are to cut 4 1/2 inch squares to end with quilt size 20x24" or 24"x24". The idea to envelope it is good & that way if Rosie gets her stitching off it won't show.
Rather then heavy quilting, etc. I think we'll "birth" it & let her use a decorative stitch to tie it. On my machine she can choose to do a single decorative character.
Think I will whip up an even smaller one tomorrow & try it & put a piece of heavy duty foil in with the batting just to see how it comes out.