"Breach" Quest of the Campaign Questine Bug

I was doing the Quest name “Breach” given by Alleria. (not in this character, my Druid toon, Audidoo.) I completed all the task and all I have to do is just return to the Quest Giver. at that time, I died to mobs and I decided to heartout of that area . but the problem is “I cannot fly back to that version of Dalaran” full with Nerubian. and then I abandon the Quest . I wanted to restart that Quest . But I cannot find Alleria in the Dalaran . I can see the Campaign Quest Icon. But I cannot find NPC who gives the Quest “Breach”. without that quest I cannot proceed to War Within. Please fix .