Merlin's Chosen Book 1 Rise of the Wyvern - Merlin's Chosen, #1

Chandra Strandon celebrates her seventeenth birthday and must now contend with the fact she was forced to move to a cave in the midst of the Grand Canyon, a clan of dragons, and the fate of the world resting on her shoulders. Oh, and she's a sorceress, perhaps the most powerful sorcerer ever to be born and the answer to a prophecy foretold by Merlin long ago. She may be the only hope left to save the last of the dragons from their enemies known as the wyvern.
Horrid beasts bent on ruling the world, led by the evil Theryn. As if she doesn't have enough to deal with, working with the wyvern is Chase Ivers. A boy, who is not only gorgeous and makes her heart go pitter-patter but tries to kill her each time they meet. What's a girl to do?