Based on the context of the excerpt, the following is the most likely reason Jing-mei wanted her mother to shout at her:
She wanted her mother to be openly angry instead of quietly disappointed.
Throughout the excerpt, Jing-mei was expecting her mother to shout at her. However, at the beginning of the text, Jing-mei knew her mother was disappointed. The text gives the impression that if Jing-mei's mother shouted at her, then she would be relieved. Jing-mei wanted to blow-off steam by shouting and blaming her mother for her misery. Nevertheless, when her mother kept quiet, she had to keep everything to herself.