The Pixie Queen — Susan V. Vaughn

In the small town of Caseville strange things have occurred…
From the time Jane Hensley was little, she knew she was different. Instead of hanging out with friends, she was often in the woods, alone, chanting magical words that filled her with power and effected the environment around her. A sudden summer storm on a perfectly sunny day. Monster waves crashing into the shores of Lake Huron. Strange things happening in nature with no rhyme or reason. Residents are mystified by these occurrences, but would never dream they could come from Plain Jane Hensley, the girl that was so quiet, it was like she wasn't there at all.
But David Reynolds, the town's football star, has noticed Jane. In fact he has been secretly in love with the strange girl for years. And on the morning of her sixteenth birthday, he is determined to finally reveal his heart to her. Instead David discovers Jane's powerful secret. A secret that has brought a magical stranger to their town. One who claims to be a Pixie King, and entices Jane on a quest.
Now David must choose whether to allow the girl of his dreams to disappear forever. Or follow her on a journey that defies logic.