On the way to Dragonstone. Jon hasn't been through the war yet. He hasn't flown on a dragon, he's not met Daenerys Targaryen. Sansa feels a pang of guilt at that and she knows that she must keep it secret from him to protect him. Unlike her, Jon still has a soft heart and she doesn't think she can burden him with any of that. Perhaps it is unfair to make the decision for him but she will, in this instance.

"Regent, yes. Things are well in hand," Sansa says smoothly. In a way, it isn't a lie. She is ruling Winterfell. She's just doing with with a crown on her head and not under authority of someone else.

"I haven't found my own room yet but I intend to. Rooming with the others is...less than desirable for me. I'm used to my quiet."