Once the quest is complete, the quest can’t be turned in. The map shows the turn in as where she gave you the quest (56.45, 61.76) but she has moved and is now mounted on Galeheart (56.5, 61.24). I have done this quest 4 times on other characters so far and not seen this bug. I have tried reloading, relogging, turning off all add-ons, and even running an arena (EU blue post suggested it).
i am having the same issue