Final answer:
Mayella reacts politely and is surprised when Atticus calls her ma'am.
Step-by-step explanation:
Mayella reacts to Atticus calling her ma'am in a polite and respectful manner. In Harper Lee's To Kill a Mockingbird, Mayella is surprised by Atticus using a title of respect because she is not accustomed to being treated with such courtesy. Atticus' use of ma'am demonstrates his politeness and kindness towards Mayella, regardless of the circumstances of the trial.