The Faire Folk Trilogy by Gillian Summers

Keelie Heartwood is just your average American teenage girl- she loves to shop, hang out with friends, go to the beach, and party. Just one little problem. She's allergic to wood. It doesn't help that when her mother dies, she's sent to live with her father, who travels with Renaissance Festivals and does woodworking. So, she's stuck with her eccentric father in a place where it's cool to be old fashioned, she has no freedom, and the one guy she likes is practically royalty, with a princess for a girlfriend. On top of it all, she has just stumbled upon a secret that will change her life forever: she's part elf. Which explains her one pointed ear, and the fact that her allergy to wood isn't an allergy at all. Not to mention the fact that when she's around trees, they tend to talk to her. Can she save the lives- and livliehoods- of her people? Or is she part of a species that is destined to die out? And, can a poor shepherd's daughter actually be with a prince, when a princess is her competition? The first book is The Tree Shepherd's Daughter, then Into the Wildewood, then The Dread Forest. I give the series 4 stars, for being a bit slow at times, but it's very good even so.