In reply to Evilllamas: Hi, had a pair until recently and found them pretty useful. I had them for similar reasons to yours and found them to be a good solution.
You might also want to look at one of these
http://www.metoliusclimbing.com/wood-grips_training_boards.html as your mother might be more amenable to the less vibrant colour than the ones so many boards come in. Also, a search of threads on here will show you that lots of climbers make their own boards from various bits of wood well fixed in an out of the way spot, so no need to spend much money at all.
Kevin.