Miss Mayhem by Rachel Hawkins, 277 pages

Life is almost back to normal for Harper Price. The Ephors have been silent after their deadly attack at Cotillion months ago, and her best friend, Bee, has returned after a mysterious disappearance. Now Harper can focus on the important things in life: school, canoodling with David (her nemesis-turned-ward-slash-boyfie), and even competing in the Miss Pine Grove Pageant.
Unfortunately, supernatural chores are never done. The Ephors have decided that they'd rather train David than kill him. The catch: Harper has to come along for the ride, but she can't stay David's Paladin unless she undergoes an ancient trial that will either kill her...or make her more powerful than ever.
This is the second book in this teen trilogy. It's pretty entertaining, all in all.