Why does the narrator’s sister act “like that” and what is the narrator’s reaction when her sister does act “like that”?

In Carson McCullers’ 1971 story Like That

Why does the narrator’s sister act “like that” and what is the narrator’s reaction when her sister does act “like that”?

Write a one-paragraph response to the following discussion question, and be sure to include specific details, analysis, and a brief quote from the readings to develop your claims.