There is a grain of truth to her statement. While many scholars now think that Revelation was written by ‘John’ - I hope that by “Baptist John”, she does not mean John the Baptist

- around the end of the reign of the emperor Domitian (95-96 AD), others contend with this and propose an earlier date, such as at the end of the reign of Nero (68-69 AD) or at the reign of Claudius (41-54 AD). The 4th-century Church father St. Epiphanius of Salamis preferred the Claudius dating, while those who prefer to date it under Domitian use the testimony of St. Irenaeus of Lyon in the 2nd century (a disciple of St. Polycarp, who in turn is said to have been a disciple of John the Evangelist himself) for this:
…
We will not, however, incur the risk of pronouncing positively as to the name of Antichrist; for if it were necessary that his name should be distinctly revealed in this present time, it would have been announced by him who beheld the apocalyptic vision. For that was seen no very long time since, but almost in our day, towards the end of Domitian’s reign…
Adversus Haereses, 5.30.3
Still others distinguish two dates: publication of the work (under Domitian) and date of the visions (under Vespasian, 69-79 AD).
And yes, it is probable that the Biblical books are not written in the order that they are arranged now in our Bibles. For example, many scholars today date some of the epistles of St. Paul (say, Romans or Philippians) to be the oldest portions of the New Testament, being dated somewhere around the 50s AD. The Gospels and Acts, meanwhile, are thought to have been written in a period between c. 60 AD-late 90s AD, though of course, some would push for an even earlier date (c. 50 AD at the earliest, contemporary with the earliest of the Pauline epistles).