In John Boyne’s The Boy in the Striped Pajamas, what makes Gretel such a challenge for her family?’

In John Boyne’s The Boy in the Striped Pajamas, what makes Gretel such a challenge for her family?
In John Boyne’s The Boy in the Striped Pajamas, what makes Gretel such a challenge for her family?’

In John Boyne’s The Boy in the Striped Pajamas, what makes Gretel such a challenge for her family?