After you have completed the quilt (with an ID panel on the back in a corner) take a photo of the entire front and back of the quilt and put the photos in a frame for your MIL. You, of course, keep a copy for yourself. This way there is photo evidence if it does get legs and walk off. Also take a photo of the quilt with the recipient in the nursing home holding it or on her lap for more proof of its location.
Just a few thoughts to help keep your work where it was intended to be -- in her room.