She'd actually be a very tough teacher for both her and for the class, if nothing else than because 80% of any given European History class is after her time, and while she specializes in the classical era, she does so on the history of regions that aren't usually covered very much, and wouldn't know exceptionally much about the usual Roman focus.
Either she learns the material fresh in her free time, or the class focuses on stuff nobody has the slightest clue on.