It's stupid – Elsa probably wants to sleep, and hey, didn't she already get a hug? But she wants- needs to be closer to Elsa right now, in ways she doesn't have words to explain. She's felt it before – that yearning to be near someone – but it's been months. She's doing fine on her own.
But there's something about Elsa being so close. The space fills up with Elsa's warmth and aroma, and Anna feels... safe.
Here with Elsa is even better than those guys. At least... at least Elsa cares about her.