CLEAN : Stars walk red carpet for The Girl on the Train NYC premiere

The transcript discusses the speaker's excitement and anticipation for an event, focusing on themes of obsession and voyeurism in people's lives. It highlights the character Kathy's role in guiding Rachel to reflect on these aspects of her life.

In what way is the character Kathy involved in the grounding voice of the narrative?

What does the speaker imply about Rachel's perspective on her life?