Sprinkling infants with a little water is not good enough for her. You have to go into the water, go under by full immersion, in order to come up a new person, a new creation. Jesus himself was baptized as an adult. In the New Testament baptisms came after the willful decisions of grown women and men who have accepted Christ, it was not the act of parents on behalf of the child. Even though Christy graduated from Princeton Seminary, where she was immersed in Reformed theology, I have to say she's right, of course.
Theological reflection shaped by scripture is more important.
There are many baptismal traditions within the Christian faith. The Anabaptist or baptist movement stressed the importance of adult or believer baptism by immersions. When you accept Christ, then you're baptized. It is contingent upon your profession of faith. Baptisms take place beside streams, in rivers, lakes, oceans, in backyard pools, even indoors.