English is not her native language, she obviously didn't understand your question. So instead of trying to lecture her on how to be more professional and "serious" when she was just trying to be friendly, you should first try to be more "serious" yourself instead of asking such a silly question: asking a person from Shanghai to declare her rates for Cantonese is like asking an Argentinean to declare his rates for French.
Thank you for your silly advise, Big daddy.