Go to a Dollarstore and get one of their cheap plastic table cloths and write the numbers in permanent marker. It will be wipeable that way. Lorraine, try tapping the hand (sometimes the added sensation helps the brain "link up" with the muscles. Or you could try throwing with her non dominant hand. That sometimes works with my clients.
I once did a knitting club. We called it Knit Wits. We'd knit and tell jokes. For those who could no longer knit, I had a memory box full of old patterns, different types of wool (some of which needed to to wound up) and assorted finished knitted projects (hats, mitts, scarves, baby clothes)
Bean Bag Number Toss