I Can't Advance Through Young Queen Of Begus, I Arranged A Meeting at Aldlyn But I can't Visit the Queen or Get the Secret Message that She Was Trying to send Me...

How Do I Continue The Young Queen's Story?

You need to finish both political meetings with Begus, before you get the invitation by the queen to meet her in her castle.

OR, if you're already after her first scene and try to advance her events further, I have to disappoint you. That's the current end of her event.