The Face on the Milk Carton

As we finished the first half of the book The Face on the Milk Carton the main character, Janie Johnson, got the answers to these three important questions:

Why there weren’t any photographs of [her] until she was five?  
Who was Hannah?
Why [her parents] wouldn’t let her see [her] birth certificate?

It seems that by the end of Chapter 9 [...]