Surrendered Heart (Payton Skky Series #5) by Stephanie Perry Moore

It's Payton's second semester at college. The death of her grandfather and a deepening relationship with Tad teach her the value of living for God. As Payton surrenders her heart to God and shares her faith, she finds out that all she has ever desired is wrapped up in Him. Her relationship with Christ allows her to be complete and to handle the growing pains of life.