Final answer:
Mayella is afraid of being judged, not being believed, and the potential repercussions from her abusive father.
Step-by-step explanation:
When Mayella first gets on the witness stand in To Kill a Mockingbird, she is afraid of being judged and scrutinized by the court. She is aware that her accusations against Tom Robinson may not be believed, and she is fearful of the consequences of lying under oath. Mayella is also afraid of the potential repercussions from her abusive father, Bob Ewell, if she does not testify as he wants.