Good for her. I have seen yo-yo Xmas trees, wine carriers, bags, as well as quilts. Here are some websites:
http://quilting.about.com/od/piecing...oyoquilts.htm; http://www.ehow.com/how_2100684_make-yoyo-angels.html
Check thrift shops, ebay, etc - you may be able to find an inexpensive machine.