Since the beginning of the series, Sansa, who has established herself as a fair leader as well as a sharp and shrewd strategist, has bristled at the thought of the North falling under anyone's rule, and throughout Daenerys' reign, she argued for the North to maintain its status as an independent territory with its own monarchs and wardens. When Jon told her about his true parentage, she immediately shared the information with Tyrion, clearly hoping to keep control of the North by not only keeping a tyrant from taking the throne, but by putting a half-Stark regent in power, and though that plan didn't pan out, Sansa ultimately made sure the North was taken care of.
During the council meeting, Sansa is hesitant to cast a vote in favor of Bran, and as she turns to her brother and tells him that she loves him and that she's sure he'll be a great king, she insists that the North remain its own territory, and Bran grants her request. Thanks to Sansa, the North can keep its identity and its independence, and since the North always remembers, its citizens will certainly remember what the Lady of Winterfell did to protect them.
