What is the author's tone in The Glass Castle by Jeannette Walls?

At first, Wall's tone is full of innocence; but the over the course of her story, the author begins to introduce a trace of irony. This irony grows as Jeannette matures, until it turns into confusion tinged with anger. As Jeannette enters early adulthood, this anger again turns to a tone of bewilderment after Jeanette's parents follow their children to New York and become homeless. Finally, the tone becomes something similar to acceptance, even as confusion continues to be interlaced with, not only the tone, but Jeannette's view of her parents' choice of lifestyle.