Okay - for those who hate the fact she's extremely social - I have this suicidal strategy for you. It works...and I can testify since I was the bait.
Convince some poor soul in your group to aggro the guards and run away as fast as possible. While they're running away - have the other people pull Samirah away from her cave. That way, when the decoy dies (they won't get away...trust me), the soldiers will return, but Samirah's already being attacked by your group - safely far enough away so no help comes. Now, so your poor decoy can get the update as well - make sure someone rezs them before the naga dies.
And there ya have it. My suicidal plan that amazingly works. ...Just be nice to the poor soul who now has to put up with the repair bill and exp debt afterwards...