My wife's a Scot, she picked up the rules pretty quickly because she has a fair understanding of rugby yawnion.
She's got a good eye for the game… she doesn't watch it regularly but she can read the dynamic of a game, make some astute observations. Downside is not really following any team, she is dispassionate and not biased enough towards the Tigers. "You guys are in trouble here, they've got you backpedalling every set" is not always helpful to hear, even if true.
She knows the drill by now - no inane questions or small talk during the game. In fact nothing besides footy whilst the game is going. My newer rule is to try not yell so much, it frightens my kid sometimes.