The Faerie Path Trilogy by Frewin Jones
(Eos, 1st in paperback, 2nd & 3rd in Hardcover)
On her 16th birthday, after a horrible accident, Anita finds herself transported to another world. This world is the world of faerie and Anita learns that she is Tania, the long lost seventh daughter of the king and queen. Suddenly, Anita finds herself in the middle of six sisters and a 500-year-old prophecy that threatens to destroy both the faerie world and the human world. She also learns that Evan, her boyfriend in the human world is really Edric of the faerie court. Who can she trust and how can she save both of her families?
Overall, this was a interesting series. Although it uses some standard fantasy elements, the plot held my interest through all three books, The Faerie Path, The Lost Queen, and The Sorcerer King. Tania, as she decides to be called, is a strong heroine who isn't afraid to battle evil but is a little afraid that her human parents are going to be mad at her for disappearing. The books are written mostly in the faerie world and Tania's sisters and Edric make for unusual side characters.
Update: There are two other books in this series. The fourth book is called The Immortal Realm and it's available now. The fifth book, Enchanted Quest, is due to come out in January 2010.