Breakdown of Na conversa com a autora, talvez eu pergunte sobre o plano dela e sobre o assunto do próximo livro.
Questions & Answers about Na conversa com a autora, talvez eu pergunte sobre o plano dela e sobre o assunto do próximo livro.
The part Na conversa com a autora is an introductory phrase giving the context (when/where). In Portuguese, it’s very common (and recommended) to separate that from the main clause with a comma:
Without the comma, it’s not “wrong” in speech, but in writing the comma is the normal, more correct punctuation.