Why doesn't Mayella confess the truth? Consider the circumstances of her life and the social context in which she must continue to live.this was in...

Think about the racial dynamics of those days and think
about what her father is like...

One of the reasons that
Tom is in so much trouble is that black men and white women are not supposed to have
anything to do with each other in that time and place.  So if Mayella has been
voluntarily doing something even a bit physical with a black man, she will be totally
scorned and shunned by other whites.

In addition, her dad
is a pretty violent man.  If he feels like she has humiliated him, he will surely beat
her.