The ability works quite explicitly from her being able to see glimmers in the Pattern. She is seeing what is being woven in the future and that is how most of the Foretelling powers work. He was actually pretty explicit in the notes about that. Though some of them of course, there are ones that are strict, meaning they see the Pattern, some of them you see how the Pattern might be. She sees the Pattern as it will be. Has anyone ever had it before? Yeah, from what I read it never said it explicitly, but it implied that this is a power that could exist again and has existed before, but there are no lists of anyone that’s had it before. It’s definitely open that somebody could have had it before, but he doesn’t actually say specificially.