Good recap, except I wouldn’t say Sansa gives LF a death stare when Jon is proclaimed King of the North. It seemed to me more like she was smiling and happy at Jon’s ascent, but then she looked at LF and a worried, almost frightened look came over her face because she knows how dangerous LF is, especially now that he’s been thwarted in his plans for the North.
You could be right about the stare. She clearly understands his lust for power, and she understands the lengths he will go to in order to obtain what he wants. His time grows short, and he will slip up and be dispatched.