Phoenix rising trilogy (Erica F. Verrillo)

Thirteen-year-old Elissa knows nothing of her origins until her father comes and takes her to the Citadel of the evil Khan, in exchange for soldiers to protect the kingdom that will one day be hers, but upon discovering her power, she chooses to follow her own destiny.

Still not accustomed to her life as a princess, Elissa, learning on the eve of her fifteenth birthday that she is to be betrothed to a man of her father's choosing, runs away and, after many difficulties, reunites with her friends to finally fulfill the prophecy of the Phoenix.