The Princess of Trelian by Michelle Knudsen
Princess Meg is bonded to a dragon, Jakl. She loves Jakl and knows he would never try to hurt her people, but they think otherwise. The people of Trelian are uneasy and don't want a dragon princess to rule them some day. So Meg's parents put restrictions on what she and Jakl can do.
Lately, Meg has been easily angered, and when she is, her dragon is, too. She doesn't know what is going on, but she knows it has to stop. A nearby kingdom has accused Jakl of killing farmers and their families, but Meg knows it's not true. Can she and her friend Calen find out who it really is? And will they be able to stop the evil Mage Krelig from coming out of exile?