I noticed when following the walk through, I had some initial issues with "a broken ritesdancer" giving me the 3rd fragment. When I told her "what rune fragment" she gave me a 6 slot container named "Threadbare Cloth Bag" and 1 "Undamaged Noc Fang". You have tell her the text 5 more times to obtain a total of 6 fangs, combine in the 6 slot container, then hand her the closed container. Upon turning in the combined container named "Closed Cloth Bag", she will give you the 3rd rune fragment.

Hope this helps someone else as it took me a few minutes to figure it out with the text she responds with.

I didn't bother to put that because it sounds like a bug. You should get the fangs from mobs and not from her.

We believe that she gives you this mini quest if you don't have faction.