Phooey. The mod ruins your big reveal, so you get to ruin mine? I see how it works. 
 
Anyway, 
Lommy had it correct. 
Nerwen was killed because the wolves 
failed to kill her on the previous Night. 

 I didn't protect anyone last Night on purpose - I had realized that 
G55 was probably the Seer, but was pretty certain the wolves would go after 
Nerwen again; if I protected 
G55 and the wolves killed 
Nerwen as I suspected they would, I wouldn't be able to protect her toNight. 
G55 revealing 
Inzilawolf wraps things up nicely, though.
++Inzil