The Unfinished Angel by Sharon Creech

In the winding stone tower of the Casa Rosa, in a quiet little village in the Swiss Alps, lives one very unlikely angel-one that is still awaiting her instructions from the angel-training center. What happens to an angel who doesn't know her mission? She floats and swishes from high above, watching the crazy things that "peoples" say and do. But when a zany American girl named Zola arrives in town and invades the Casa Rosa, dogs startarfing, figs start flying through the air, lost orphans wander in, and the village becomes anything but quiet. And as Zola and the angel work together to rescue the orphans, they each begin to realize their purpose and learn that there is magic in the most ordinary acts of kindness.