Same book is in the hands of another 'attendee' in a lower picture. Book has an orange spine and a sky-blue back. The sky-blue back is visible in the lower picture. The lower one looks like an arrival shot as they are all filling into the cafe. The later shots show her with the book, and with a 'cake' or 'bread' of some sort, in a bag - something to take home ... So I imagine one of the attendees gave her a book and she's taking it home.