My wife is a Dryad, and let me tell you that the best thing you should do is wait for fall, and pick the apples from her tree!
Then you should turn the apples into juice, and scatter the seeds around the tree in a circle.
Then, repeat the chant three times
Oro spiritibus terrae ut pervagentur haec dryades
Benedicta sit humus a pede suo
Sit baca virgulta
After that, defeat the demons cursing her in hand to hand combat.
Then she will be free to walk the earth!