[she had noticed. it makes her feel ashamed now to think about how she had wished their father would scold arya for bringing him flowers, when she would give anything to bring him flowers herself just one more time. now that their mother is gone as well, however, she thinks he could have at least told her off for muddying her dress. it wasn't fair that mother always had to do it.]

Only because it's a lady's duty to see that her children attend to their lessons, and father was busy being lord of Winterfell. And she was the one the washerwomen complained to, when they had to launder your dresses all over again because you were crawling after newts through the Wolfswood.

[sansa is only guessing on that last one, since a lady manages the household affairs. it's stands to reason she would hear complaints from all the servants. sansa had been to young to hear much about the official business of the castle.]