Essie (Esther) is the youngest in a large reality TV evangelical family/brand, Six for Hicks. Her dad is the preacher, but it's her mom who's calling the shots (pun). Essie has played along for all of her 17 years, even while scheming a way out. Her moment comes from an unplanned pregnancy, and Roarke, the boy she chooses to play her husband.

That description should be enough for you, but I'll add that it's quality white lady literary YA.