Not a pilot, so my Spanish is better than the details, but the conversation from the transcript is noticeably heated, with Celia pointedly rejecting the flight plan ("consulte bien y cambie el plan de vuelo", approximately "think twice and change the flight plan" and washing her hands of it and insulting the dispatcher ("ya no insiste mas al ver la terquedad del despachador", "terco" exactly "stubborn" as one might say of a donkey). She went on in part 4 to criticize the dispatcher for promising to change the flight plan and then a half-hour later coming back stating they would make no changes ("me indico que se mantenia todo igual"), finally stating this answer demonstrates her complaint that dispatchers "many times" do not take their advice seriously.
Whether this amounts to culpable recklessness or dereliction of duty on anybody's part is for higher-ups to say. To me, it certainly seems to do just that.