My grandaughter was only 4 when she made her first small quilt about 24 x 30 inches. We started with a quilt as you go with just strips sewn straight down, folded over and pressed. When all the strips are finished, there is nothing left to do except the binding. If you cut the backing large enough, you can just fold it over the top, press and sew. Or you can teach the binding method and I think at 10, she should be able to do this pretty well.