In Bernini's "Apollo and Daphne" how does Bernini show us her transformation? What does she turn into?

A quick look at the sculpture would clearly show you that she is turning into a laurel tree.

In Bernini's "Apollo and Daphne" how does Bernini show us her transformation? What does she turn into?
Thus the scene ends by Daphne being transformed into a laurel tree to escape her divine aggressor.