In the book Roll of Thunder, Hear My Cry, what happens in Strawberry and how does Cassie get revenge?I need to know exactly what happened and how.

It was an exciting day for Cassie, since she had never
been to the big city of Strawberry before. It proved to be a great disappointment in
many regards. First, Strawberry was a small town, "a sad, red place" with one paved
road, lots of mud, and "gloomy store buildings." Although Cassie and T.J. were told to
wait in the wagon, they decided to explore. It would prove to be a big mistake. After
entering the Barnett Mercantile store, Cassie waited in line for Jim Lee Barnett to fill
Big Ma's order. But Barnett repeatedly ignored Cassie, waiting on white customers who
had come into the store long after the Logan children. Finally, Cassie had had enough.
She spoke up, demanding politely that Barnett wait on
her.

"Whose
little nigger is this!" bellowed Mr.
Barnett.

After responding
that she "ain't nobody's little nigger," Cassie was ordered from the
store.

But things only got worse. Outside, she literally
"bumped into" Lillian Jean Simms. The young white girl demanded an apology, and when
Cassie refused, Lillian Jean's father threw Cassie into the street. Cassie suffered yet
another indignity when Big Ma forced her to apolgize to Lillian
Jean.

Cassie got her revenge later. After pretending to
subordinate herself to Lillian Jean by carrying her books after school each day, Cassie
suddenly did an about face, "smashing Lillian Jean's books on the ground." She then
tackled Lillian Jean, punching her repeatedly before demanding an apology from the white
girl. Lillian Jean apologized, all right...

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... for herself and for her father. For her
brothers and her mother. For Strawberry and Mississippi, and by the time I finished
jerking at her head, I think she would have apologized for the world being
round.