Anna does get it. She does understand, and maybe that's why it hurts so much more acutely than it has any right to.
After all, she lost her brother.
But Elsa pulls away anyway, reminding Anna that she isn't...
She isn't enough.
She's not the babies' mother. She's not Elsa's girlfriend. Nothing.
But she wants to help, because this hurts too. Not as much as it does Elsa, of course, but... she's allowed her own pain. Her own grief.
She wants to be there for Elsa. Elsa... doesn't seem to want her.