What is the mood of “The Stolen Party” by Liliana Heker?

The story has a general mood of sadness. It is sad to see Rosaura’s dreams crushed at the end of the story, when she does not receive a present, like the other children who attend Luciana’s party. This goes on to confirm what her mother has been trying to tell her, that Luciana does not consider her a friend, rather, the daughter of their maid.
It is heartbreaking that in spite of Rosaura’s great contribution to the party—made out of love for Luciana’s family—she is still not considered Luciana’s friend. When Senora Ines says “What a marvelous daughter you have, Herminia,” Rosaura beams with pleasure and expects to be given presents, just like the other children before her. When Senora Ines hands over two bills, from her purse to Rosaura and her mother, Rosaura’s “arms stiffen” and she “presses herself against her mother’s body”, with her “cold clear eyes fixed” on Senora Ines’s face.
Also, one can’t help being angry at society for the kind of social biases it passes on to innocent children. Clearly, Rosaura is innocent of any biases, as she refuses to believe her mother’s opinions about the rich. She “thought it unfair of her mother to accuse other people of being liars simply because they were rich”. Though she is encouraged to do things that the other children do not do, such as collecting party things to and from the kitchen or passing the cake around, she does not understand that she is expected to do these things because she is “different” from the other children. It is as if she is being prepared for a future as a maid.