Montages of her brother starving to death?
The movie should have stayed true to the original story, in which there are many miniature chapters having to do with her younger brother, loyally staying inside the family's secret closet.
He goes through a hallucinatory metamorphosis, sometimes almost reaching out to open the door, and then remembering his sister's words. There are moments of torment, when the pangs of his thirst and hunger are overwhelming, but he refuses to leave.
The movie should have shown this, pieces of him crying, starving, and the actual corpse should have been shown, as it was described in great detail in the book.