I did the quest "The Speaker Awaits" (quest link: https://www.wowhead.com/quest=45788/the-speaker-awaits), and when I go to the NPC Betild Deepanvil to complete it, it doesn't let me complete it. The question mark (?) appears in the map, but when I talk to her there's no "Complete" button.
Below are some screenshots of the situation.
(Please help, this is the quest line for the priest mount so I want to complete it )