The stony expression on Sansa's face was probably rather reminiscent of her mother, "She was injured, but ... she had a mage heal her." Although Sansa really didn't want to think on the injury that her sister sustained, nor what happened to Margaery, given how much death was in their lives. "But we do live together, with Margaery, who was something of a sister to me, and the Lady Diana." Who was, again, another brave, strong warrior.
"She intends to hold swordsmanship classes." And a glance at Torunn's sword had Sansa smirking slightly, "Perhaps she could use the assistance from someone equally skilled."