Chosen answer:Julie was not the publisher's daughter. Julia, who we see at the end, is the real daughter - given that Sarah doesn't seem very surprised to see Julia at the end (and the reaction of the secretary proves she's known to everyone), the most likely explanation is that the entire sequence in France is in fact the content of Sarah's book, and never really happened.
Chosen answer: Julie was not the publisher's daughter. Julia, who we see at the end, is the real daughter - given that Sarah doesn't seem very surprised to see Julia at the end (and the reaction of the secretary proves she's known to everyone), the most likely explanation is that the entire sequence in France is in fact the content of Sarah's book, and never really happened.
Jon Sandys ★