The face on the Milk Carton

I am reading a book called The Face On The Milk Carton by Caroline Cooney. It is about a girl named Janie who is eating lunch in the cafeteria one day at school. As she is eating, she looks on a milk carton and sees a young girl's face on it. After she stares at it for a while she realizes or she thinks the girl is her, or is it? It said the girl was kidnapped at age three from a mall in New Jersey. Is this possible?

Janie thinks about this all day. She cannot get it out of her mind. Would her parents kidnap her or was it like Sarah-Charlotte said that kidnappings are only when parents get divorced and one parent takes the child somewhere without telling the other parent? Her parents loved her, would they do something like this?

I love the concept of the book and it keeps me really hooked. It is kind of predictable that she will go searching for her birth parents even behind her "parents ' back. she is determined it let them know she is okay.