Words Can Hurt
Even a moment this brief can tell a lot about a character in Frozen. This is Elsa’s reaction after Anna says she knows more about true love than Elsa, since she (Elsa) only knows how to shut people out.
Just look at the way Elsa recoils. You can see that she slightly widens her eyes, mouth, and raises her eyebrows. These facial movements all clearly show how hurt she is from Anna’s words.
And why is she hurt by Anna’s statement? Because Elsa DOES know what true love is! She shut Anna out for more than half their lives, but Elsa did it to protect Anna, all because she loves her!
Of course, since Elsa won’t tell Anna the truth, it’s no wonder Anna said it. And furthermore, it hurt Elsa to push Anna away, so now hearing what Anna said hurts Elsa even more. :(