I was wondering if there is a fix to this dialogue bug, Jaheira has already said the same thing to me three times,"Ahh, there is an ill wind in the air..." Or could it be she'll keep saying it until I get out of the Underdark so the Harper Quests resume?

I think you've just entered the buggy part of Jaheira's romance. If she doesn't stop being a broken record by the time you're out of the Underdark, I think you can force the LT through Shadowkeeper, or else use the console to create you-know-what for the romance to progress.

Same thing happened to me once..Use SK to change the number of the lovetalk.
it will solve the problem..