Ok, so here are my thoughts... Because of the introduction that Ms. Kostova wrote, it must be assumed that she is referring to herself as the daughter. Unless anyone can come up with a better response to what her name is, that would be my best guess as an English Professor. While reading this book, I found it quite intriguing that the girl's name is never mentioned, but not surprised. This is not a new tool, but something that is rarely used. In the book, "Rebecca," for example, the name of the wife is never mentioned. She is always living in the shadow of the first wife, Rebecca, who the book is named after. Yet, at the end of the novel, the second wife is never named. So I must say, Ms. Kostova, I would really like to have a second book dealing with this young lady and hear more of her story.
I don't think the author is putting herself in the novel as the daughter of Paul and Helen. The daughter is the main narrator and begins the novel by saying that she is recording events that occurred in the past. The rest of the story (except for the end in which we are back in the "present") is the narrator telling the story, even if much of the story is told thru others' letters. This woman remains nameless. We only know that she is named after Helen's mother, however Helen's mother is never given a name. I also don't think Paul, her father, is given a surname. While I understood the significance of the second Mrs de Winter remaining nameless, I fail to see why the author of this book choose to give some characters names and others not. I don't think there is anything left to say about the daughter. She has told us everything about herself that pertains to the novel. The only reason for Kostova to write a sequel to this (which I don't think I would read) would be to explain the ending to this book. Is Dracula still alive? Or has one of his minions taken over? I thought that once the leader was killed (Dracula) then all vampires made by him would also die. That ending (with the unnamed narrator being handed one of the imfamous Dragon books) was terribly contrived. Kostova wanted a shocker/twist ending, so she wrote one, even though Dracula was killed beyond a doubt. I did not like this novel and don't think I can recommend it.