OK, I killed Nirya. After a while, I saw here walking around the college. She retained her same diologue, but she would sometimes say "Uhhh" like a raised corpse. When I used "Detect Life" she didn't show up, but for "Detect Dead" she did. When I re-killed her, she moaned, "At last." I'm scared, because this has never happened, and I can't find it on the internet.