Lily continues to make it very clear that she and her peers are young and extremely naïve. They've never considered that their aunt, usually so happy and kind, could have lived such a miserable life. She too had to leave her family, and wasn't able to bear sons and accomplish a woman's ultimate goal. Aunt, however, accepts that there's nothing she can do to change her fate—she's bound by tradition and custom to this miserable life. This turns tradition into something restrictive and controlling. This brief scene is, tragically, one of the only times the women of the novel talk even relatively openly about the pain they’ve experienced and their desire for something better.