so first... I love you all! *twirls in joy at the awesomeness of Group Two*
anyways on to the srs bsn... Seda is actually at Ostagar or at least the trees surrounding the ruins. She has been there for some time now sniping at darkspawn and generally becoming a paranoid wreck. She is essentially staying in the area to die but nothing has killed her yet. That should at least tell you she will not be the most stellar personality when you meet.
Since she is a little high-strung at the moment I am seeing her shooting in your direction, thinking you are more darkspawn, before she realizes what is up. The fact that you are essentially a Grey Warden party makes her obligated to help you. She feels she owes the order a great debt and will aid them in any way possible.
Lets see walking order next... she is a melee rogue and is all about striking fast backing off and repeating. I would place her on one of the sides so wherever people think she will fit best as long as it isn't the middle. She is not squishy.
Once the evilness is done with and there is more camping it is likely that Seda will be perched up in a tree, at least til she learns to trust all you new people.
I will be stalking you all until we meet up. Can't wait!