I'm not too sure about this, but I think I remember once when I was playing "A Traitor's Grave" for one of the first times (so it was a few years ago) I decided to follow the mayor and see where he'd go, so after much trouble with trying to keep my archers from killing the mayor he walked up the main road. My units fell behind and he got off, but I SEEM to recall seeing the actual Shiver unit. I think she was called the '-something- Lady' or something-or-other. At the time I didn't think much of it as I wasn't really involved in the Myth storyline and thought it happened every time. After looking at your journals it jogged my memory. I spent a lot of last night trying to find her by following the mayor. Mabe she only appears on a certain difficulty, or mabe I dreamed the whole thing up.
Given my memory is so hazy I'm not going to pretend that I know I saw her, perhaps someone else can tell me if they remember anything like this AT ALL?