What is the paraphrase of Luna, Chapter One?

In Chapter One, Regan wakes to a presence in her bedroom at 2:30 A.M. Wearing a flapper dress and a blonde wig, the girl announces that she has decided to be called Luna, appropriate since she is a girl who can only be seen in the moonlight. When Regan calls Luna a freak show, Luna asks if she loves her, and Regan thinks "yeah, I loved her. I couldn't help it. She was my brother"