Anna doesn't want to cry. She doesn't want to be sobbing her heart out, alone and heartbroken in her room, but there's nothing she can really do about it.
She barely lasts until she closes the door, so once she starts, there's no hope of ever stopping. Pressing her face against her pillow until she feels like suffocating, she curls in on herself, unable to forget how Elsa looked at her, shock and sadness on her features.
Anna's sobs begin anew.
Of course Elsa didn't like her.
How stupid to think that she would.