It's a little easier to think now that they're walking again, and she can't help but wonder what she's getting herself into with all of this. The touching, the walks, soul searching gazes? She's not stupid, and she's not as oblivious to these things as Castiel. She knows what this is, as least she thinks she does. It's not the first time she's experienced this after all, the only difference is that last time it had been aged seventeen, with a normal guy who attended the church she went to. Not one of her garrison, not one of the Fallen, not Castiel. It's not fair, she knows what this is. She's had the experiences, and she recognises these signs for what they really are, even if she's not about to admit them to anyone. Castiel though, he wouldn't know what to look for. He wouldn't have a clue that her motivations are less than innocent, even if they are mostly subconscious decisions.
"It does, doesn't it." Her hands disappear into the pockets of Castiel's jacket again, and though she keeps her eyes trained on the floor rather than looking at him she's still smiling, and there's a small surge of affection for him as she nods her agreement. "I'm glad it was you. We could have been stuck with just about anyone here, if things had gone differently, if someone else had gone to save Dean, if I hadn't stuck around. I'm glad I got you."
That's the closest she'll come to admitting the truth, to herself as well as him. She's not stupid, or oblivious, but she is very much a fan of self-preservation. One of the things preserving that self is her close connection with Castiel, and she's not about to sacrifice that. Without him there as a constant companion, she's not sure how long she would have lasted around here on her own. That's not even taking into account the times he has actually saved her life, either. It's far safer to keep quiet on those strange feelings that she's choosing to ignore and reject. If she doesn't acknowledge them, then it's not an issue, right?