Hmmm. Reread the last journal entry in the basement. She says she's taking her ring to Baldur's to show what it can do. It is implied that the ring is based on her research.
So, perhaps there is something to it being used to keep the tadpole in stasis. Maybe she went to Baldur's, there was treachery and betrayal, and the Sussur research, ring and all, was taken and used.
Ah, but it's clear it's shadow magic, not anti magic. I keep going back to that.
