The History of Great Things by Elizabeth Crane

This is a conversation (?) between Betsy Crane and her mother Lois.  Betsy appears to be writing a biography of her mother based on Lois's successful career as an opera star.  They seem to be looking in the same mirror but seeing different reflections.  Is Betsy looking for the truth or the best version of her mother?  Does Lois agree on what the best version or the truth is?  Sometimes witty, sometimes brutally honest, sometimes melancholy, they discuss both personal memories and events around those memories.  Not sure if this was just a very strange way to write a memoir or something completely other.