i don't know how the shards look like, but if they look kind of flower petal-ish you could sand the edges and arrange the shards like petals and attach it to something, i don't know. you could make multiple things, like the vase and a necklace...
OHHH!! ok i've got it now!
you could make a necklace with the charm being the shards arranged like a flower (the edges being sanded of course!)
im sure whatever you do, she'll love it because you put time and effort into it. sorry this is so long!