When she or anyone is ready to layer for quilting get a Micro Stitch tacking gun!!! I've used this for all my quilts and never "get stuck" or have to fiddle with safety pins (not fun for arthritic hands). Get this brand as the other one I saw had longer tacks and a fatter piercing needle. This was an "as seen on TV" at one time but now available at fabric and quilting stores.
Instead of the kitchen floor, see if your local library has a meeting room with those beautiful long tables! Put a few together, take a friend and done! I just phone ahead for a time.