What is the narrator point of view in the book, Her: A Memoir?

The memoir, “Her” by Christa Parravani is written in the first person. While the book is authored by Christa, the voice of her identical twin, Cara Parravani is also present. Before she died, Cara was working on her own memoir. Christa found passages from Cara’s book that she included in this book. By doing so, she allowed both voices to be heard.