Esther, think about "her" and what you think she likes or what you know about her or about any "objects" you all have worked with or talked about. I knew my T liked the color blue and music and a few other things.
I found a metal "wand" and one end was shaped like a star and there was a ribbon on the other end which was curled, like a paper clip. But one could bang the star end on a hard surface and it would vibrate like a chime/tuning fork. The whole effect was "magical" which made me think of therapy :-)
Another year we had worked with clay once and I had trouble with the whole thing and later I found soap you could model :-)
http://naturalplay.com/store/soap.html which I gave her.