As it turns out, Kristoff is wrong.
He can't make it all better, but just being there helps. Frankly, Anna needs someone. This Elsa woman is probably only person who could make it better, but that doesn't mean Kristoff can't wipe Anna's face and try.
Anna's had her new roommate for three weeks, and eight times she's visited Kristoff, crying.
Nothing is looking up until the ninth visit, when she says softly, "Elsa took my suggestion. She... thanked me..."
She smiles because she's helping. She's making amends.
And Elsa's letting her.