Sansa didn't save shyt.
Sansa played politics and games and got thousands of people killed because she didn't wanna tell Jon what she was planning so that they could better strategize. If Littlefinger wasn't tryna fukk she would have been useless.
The North hasn't been independent in centuries and the Warden of the North has already pledged his loyalty and is tryna honor his word. It's only Sansa who has a problem with that because she wants power for herself and knows Dany has more influence over Jon than she does.
Dany was in the field fighting with the soldiers while Sansa was hiding making snide comments. Now we see why Ned didn't tell Cat shyt. Tully's can't hold water.