Why did Hannah kidnap Janie in the movie The Face on the Milk Carton?

In the movie "The Face on the Milk Carton," Hannah kidnaps Janie because she believes Janie is her daughter, who was abducted years earlier. Hannah has struggled with her own trauma and mental health issues, leading her to act on her misguided belief that she is reuniting with her child. Her actions stem from a desperate need for connection and a distorted sense of motherhood. Ultimately, the situation highlights the complexities of identity and family.