» Sat Jul 21, 2012 10:23 am
Man, I've done that little odd job so long ago I don't remember how it went down. I checked the strategy guide and it doesn't explain anything.
However, the wiki says if the Dragonborn's Speech skill is at level 100, you will not be able to complete the quest. It also says "Sometimes the Dragonborn will find that Ysolda will not offer her quest. This happens if the Dragonborn has an active quest with Lami, Captain Aldis, Rustleif, Siddgeir, or Torbjorn Shatter-Shield; upon completion of any of their quests Ysolda's quests becomes available again."
The wiki also says "If you find a mammoth tusk before accepting her quest to find one it may not come up at all".