They end up having to stop at a roadside diner for lunch. It's mostly shit food, but they share a sundae afterwards and Anna finally feels lighter. Less burdened. She actually smiles, and she knows it's because of Elsa. For Elsa.
She wants to reach out and touch her, constantly. Hold her hand and get another hug, just because it felt so perfect.
Anna's known for a while now how stupid this is. But now, after the fragility of the night before (or perhaps because of it), she feels ready to be just a little more open.