An awareness of The Game is the very first thing worth knowing. Brienne believes there's still a system, that good and evil are at stake and not agendas. She will likely continue to be a pawn in the mean time. Frea and any sort of council she'll bring is at least some she feels will make sense to her.

She was about to lift her fork to her mouth. Oh. Her blue eyes blink and her mouth opens and shuts. "You...are a queen?" And thusly she's sitting with one casually no escort--whoops wait, well Brienne could very well be her escort now couldn't she?