Like I say, that is her standing still.
It doesn't happen all the time and it's more noticable with some NPCs than others. Training with Yakin Bael was particularly noticable. He moves around between trainings anyway; sometimes you'd find him doing this. Ra'Virr in Balmora sometimes takes what looks like a mid-pounce pose when you close the barter screen.
Not a major thing, obviously. Just looks a little odd.
Possibly unrelated, but later in the same session, I went to see Creeper. And then couldn't get out. The doors clunked but the scene stayed as it was. So I figured something had spring loose and thought I'd save, quit and reload. Well, that gave me a popup about an Ogre Exception.
I got this lot out of the log file.
- Spoiler: Show
I just wish I could be sure if I've seen the pose thing happen before this play session or not
Post crash, I reloaded from the last save I had. As it happens, just before the screeny posed above (and now fixed so it displays properly).
She's still doing it in the reloaded game. Let's see if this session crashes too, I suppose.