After clearing up Purnisc house and finding real person return to Kaenra in Goose and Fox inn.
Select the second option (lie) and return the ring to Kaenra - quest is marked as complete and you receive an amulet in reward.
You can still talk to her and continue selecting the second option - even though you don't have the ring anymore she will continue giving you the each time you talk to her.
Selecting the first option (telling the truth) you'll receive an amulet but she will not be bugged anymore.
