I had to use the console to get around the part of the http://www.uesp.net/wiki/Skyrim:Return_to_Gracewhere it wouldn't complete the quest even after you gave the women the necklace nor would it mark the quest as complete. I finally managed to complete the quest. Although it didn't get removed from my "Miscellaneous" section. It won't even let me select it anymore, so I can't do anything with it. All it says is "Speak to Greta about returning to the Temple of the Divines." Tried going back and talking to her again, and messing with the console but still nothing. Is there anyway to remove the from the quest log even though it's considered to be completed?