She’s a darkfriend, which is like a cultist. They commune with the bad guys in dreams. She touches on this, and Thom uses the term “darkfriend”. You’ll learn more about them.
All in all, it’s a decent start. There are some flaws, for sure. But it’s solid.
When it comes to some of the changes with Mat and Perrin, I think they needed something to help distinguish them all. On the books that’s easier because you get their thoughts. But they don’t have that luxury here, so they added some stuff so that it’s not just three farmboys.
In the case of Perrin, I think it’s to set up the whole “hammer or the axe” bit that he struggles with later on in the books. His wife had the hammer and he had the axe, so it makes sense. Not sure if it’s necessary…but they’re gonna have to condense some things. We’re not getting 14 seasons of this.