I can't seem to fly back to Thrallmar in Outlands.

Hey there everyone.

I've gotten to Outlands a few hours ago and have been to Thrallmar already. My brother asked me to go and help him to level up a bit by STV and to a flight back to the Dark Portal. However, after helping my brother out, I can't seem to fly back to Thrallmar. I've been right-clicking Vlagga Freyfeather (the FM at the Dark Portal) but all I get is her telling me some information (I think her last sentence was "[...] I can't imagine how my family lived here").

Any idea on what I can do? Thanks :)

You didn't train flight path in Thrallmar so she can't ride you to there. Her services are available only first time through the quest as far as I know, after that you'll need to learn the flight path in Thrallmar to be able to fly to there.