Bruh.....she was foul.
If this is a sign of things to come from Sansa she's going in Cersei's direction. You can say whatever about Jon's actions in the fight but, Jon survived up to this point. He knows how to fight and lead, or have yall forgotten that this quick Sansa kept info from him that could've changed the outlook of their battle. They had 2,000 soldiers. Bolton had 5,000 or 6,000. If Jon knew Sansa had another 10,000 nikkas in her pocket, you don't think that changes everything? What she did was foul. Ned would not have looked at her favorably for that. Cat would be looking at her funny for being so cold about Rickon not being worth saving. For example, Sansa was once a "lost cause" like Rickon. Yet Cat did all sorts of dumb things to find her daughters, made Brienne swear a blood vow to find her girls. Which is the only reason Sansa got saved a few episodes back. If other people had her coldness, she wouldn't be here right now would she I'm not saying Rickon could've lived but, her attitude towards it is not flattering. Secondly, Sansa is supposed to be a Lady of the North. It is her job to protect the people of the North. The Starks were basically beggars when Ramsey was in power. Nobody had to help them. But a few people decided to stay loyal. How does Sansa repay that loyalty to those few Northerners who stayed down with them? She withheld crucial information and made the North think they were outnumbered and went off to their deaths, when in reality, they really had 12,000 people. That's something Ned would never do. That's Cersei and Littlefinger shyt.
This is possible for sure, but I think it's a lot more likely the writers are simply in love with cavalry saving the minute at the last day.