Why is Annie haunted by her brothers death?

Annie is haunted by her brother's death because she feels an overwhelming sense of guilt and responsibility for not being able to prevent it. She constantly revisits memories of their relationship, grappling with unresolved emotions and the impact of his absence on her life. This emotional turmoil manifests as a deep sense of loss, leading her to question her own identity and purpose in the wake of the tragedy. The haunting serves as a reminder of her grief and the fragility of life.