That "Murder the Princess, the army she's brought with her, and dispose of the bodies and the forged decree" is openly on the table indicates that she has so little actual support that she has no chance of winning this succession war.
And you know what they say about games of thrones. "A strange game. The only way to win is not to play."
Or is it "May the odds ever be in your favor?"
Whatever. It's something relevant, I'm pretty sure.