Mentioning the assassination attempt will help, if you finished the Lost Templar quest. Mentioning Arl Howe’s dungeon will help if you finished the Tortured Noble quest. This will confirm Arl Wulffe’s vote if you spoke to him in the Tavern. Make sure that you tell Loghain that the Blight is the real enemy, not Orleas. We can’t prove that and it makes us look weak. The really important thing is to not mention that Loghain left Cailen to die. There will be a bit of a debate and you’ll need to defend yourself. You only have one vote going in and need to secure the rest. You can persuade her to step down, but you might as well fight her and get the cool sword. She can cause a lot of damage, but she’s very vulnerable once you corner her. Have your tank distract her while someone kills the mages. She should only have a few guards and mages for support.
She’s easier to fight this time than in the Palace before. Ser Cauthrien is standing in our way and refuses to let us in.
Going to the Palace will trigger a bit of a fight.