It has been speculated that sansa might've been unconsciously warging into a bird to see marillion in the sky cell
When she closed her eyes she could see him in his sky cell, huddled in a corner away from the cold black sky, crouched beneath a fur with his woodharp cradled against his chest.
I wonder if something similar was going on in these passages in Sansa VII, ASOS
Drifting snowflakes brushed her face as light as lover's kisses, and melted on her cheeks. At the center of the garden, beside the statue of the weeping woman that lay broken and half-buried on the ground, she turned her face up to the sky and closed her eyes.
Sansa goes into a trance like state after closing her eyes, and when she's opened them she starts building winterfell. Could it be that she warged into a bird flying above winterfell, which helped her replicate its layout so effortlessly? In fact, the very moment after closing her eyes, her head is filled with thoughts of winterfell. Following these thoughts, perhaps her warg abilities helped her to warg into a bird flying above winterfell.
She could feel the snow on her lashes, taste it on her lips. It was the taste of Winterfell. The taste of innocence. The taste of dreams.
Dreams are heavily associated with warging in asoiaf, so the strategic placement of this word here could be a hint.
So we have Sansa closing her eyes and entering a trance of sorts (by the time she opens them the sky is lighter so a considerable amount of time has passed, and she doesn't remember falling to her knees, suggesting her faculties were directed elsewhere). Then we have her mentally engaging with the snowy landscape of Winterfell in a dream-like state.
Sansa closed her eyes to see them in memory. "They're just white lumps."
When littlefinger asks her how the gargoyles in Winterfell look, she has to explicitly close her eyes again to bring them to mind. Now again, it might as well be that she is drawing from her "memory" to imagine how they look, as she herself narrates. Or it might be that this is another classic unreliable narrator trap that we've seen the author use. There's a thin line between "imagining" and "warging" and if we assume this is among sansa's early unconscious attempts at warging, it would be hard for her to tell the difference, and she would rationalise what she saw as mere memory. Sansa building winterfell is brimming with symbolic importance, and I don't think anything in this scene would've made the cut if it didn't mean something, so this tidbit can be read as the author emphasising and reinforcing his earlier hints.
I'm not saying that any of this is absolute. I'm merely speculating. You are free to disbelieve all of this. I'm open to being wrong, perhaps she just has an extremely vivid photographic memory and grasp on building layouts and stuff for all I know. Sansa's warging abilities or lack of thereof doesn't affect my love for her as a character. I might even be venturing into tin foil hat territory here, but I just wanted to share something that struck me.
