I think Sansa will never be a Stark again, tbh. Something is going to happen so that she can never reveal her true identity and will live distantly from the North. I think that's the symbolism of Lady getting the sword early on. I've thought similar things about Arya, that she will never venture to the North again, since Nymeria was chased away buuuut after the whole "Starks are wargs" thing I am having second thoughts. Too much Tully in Sansa and Robb, maybe! Not Wargy enough.