I’d like to think that when Susan Pevensie heard the news of the train crash, she changed.
Distraught with grief, the realization that she is the last Friend of Narnia hits her, and she becomes desperate to get back. Any time she hears of anything abnormal, she is there- hoping to see a portal to a sunny beach or snowy woods once more. She volunteers at the orphanage and listens to the stories of far away lands the children find while playing, and her heart breaks each time she does not find her beloved Narnia. She loses hope and slowly grows old with age, telling her children the stories of her youth and former position as queen, yet they take it only as fiction.
As she is about to lose all hope, she sits down in her rocking chair and stares at the horizom, praying to find a way back to Narnia. As the sun rises, a glimmer of Aslan appears. She walks towards him, the smiling faces of her siblings reflecting in her mind.