If it was mine I wold sew it together and give my gran, without anymore quilting on the border. I would include a message will finish with love on my visits. Sit chat and enjoy her company and you hand stitch while you are visiting. She will enjoy your company and the quilt at the same time. My gran wanted visitors no matter when or what you do. My gran always left the most important thing to tell us to when we were leaving, just to keep us a few minutes longer.
The quilt even if WIP will keep her wrapped in love when you go.