По моему, вы во второй главе что-то упустили. Небольшой отрывок.
"Susan knew she was in trouble when her auntie fixed her with a glare before going towards Dumbledore's office. Auntie Amelia rarely glared at her. Was she on Harry's side to? Harry...Harry had run away from school. Maybe she'd gone too far? She hadn't imagined him running away. It was just school stuff. Would he take it that personally?

Well, her aunt would find him, right? He couldn't be that far."
Почти в самом конце, сразу после мыслей Рона, о том, зачем Гарри сбежал.