The third and last Anne of Green Gables was made in 2000, when Anne Shirley was an adult, and a teacher.
But lets not forget the 7(??) seasons of Road to Avonlea which was a painful sequel to Anne of Green Gables staring the still childlike, but incomparable Sarah Polley who seemed to have quit acting in 2010.
There were more novels written than they ever televised, and those dealt with the years that Anne and Gilbert were married. One of the novels is about their daughter, Rilla (obviously named after Marilla, Anne's beloved guardian who was played by Colleen Dewhurst on TV).
Sarah Polley became a director, and is a very good one.
In Reign, I think most of their money is spent hiring these Castle grounds for the exterior adventures, I doubt they'd take a couple days off shooting every time they needed to teach these child actors a new dance even though that was probably very important back and proved that you weren't an idiot or a savage.
First of all, the actresses weren't children. And even a 15-year-old noblewoman was expected to know her way around a dance floor in those days... because by that time, she would have had 8-10 years' worth of lessons. Young male nobles received dance instruction as well, because it was considered an essential part of an aristocrat's education.
Second of all, the "dancing" on the show doesn't resemble any kind of medieval or Tudor-era dancing I've ever seen, whether in other historical dramas, reference materials, or SCA dancing.
If they couldn't have afforded a professional dance instructor, they should have hired a few SCA dance instructors. There are probably several in the region where this was filmed, and since SCA dancing (there are even University of Ithra courses on dancing; I took one of them) is based on historical research, the TV series would have been more authentic in those scenes.
What I saw on TV was a cross between a minimal attempt at authenticity (the hand-to-hand movements and lifts), but the rest of it looked like slow-motion disco and modern country/western line dancing for couples. And there was zero attempt to make the background music match the dance scenes. In one instance it sounded like hillbilly music during an attempt at a stately, dignified dance, and in many other scenes it was some kind of rock music or what I tend to think of as "generic radio music."
Dancing among the nobility was considered a very important skill, especially for women (I was pleased that there was a scene where Mary's ladies were being taught a new dance), and it's something they begin learning as children. And of course people danced just for fun, but the formal occasions were also opportunities to speak with people it would be inappropriate to speak with on normal occasions. If you're trying to carry on a flirtation with a particular person, the dances where partners change regularly are especially handy for this. Because you're dancing with several partners, you're not singling out any specific person (or at least not being seen doing so).
But I rather suspect that of course they would have hired some sort of dance instructor who had the attitude of "meh... who cares if it's slipshod or too modern, the audience won't know the difference."
I will say that as the characters got older their costumes got less weird and slightly more authentic, though still not even close to accurate.