Great Expectations
Why did she want him to read that book???
Obviously it goes back to their conversation about reading books from earlier in the film.
It is possible that is the book she was reading at the time. It is also possible it is just a classic that she thought he should read.
The book is about an orphan who ends up with great expectations while the main female in the book is a rich girl that he falls in love with. So, you could theorize the plot of the book had some connection to the movie. It is also possible that just the title of the book alone fit well with the movie.