Answer:
She employs the literary device of "irony". Dee's ill-equipped understanding of her own heritage supports this claim. She tells her mother "that she does not understand her heritage." There is also irony in the lack of appetite for the food that has been prepared by her mother.
Explanation:
This is the most prevalent device Alice Walker uses.
The definition of "vengeful" is:
to harm someone in return for a previous injury.
Basically, seeking revenge.
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The most likely reason that the prologue reveals the above detail about the play is:
to engage the audience in the tragic story
The prologue of the play “Romeo and Juliet” tells the audience about the place where the play will revolve on. The feud between the Montagues and the Capulets is also been introduced to the audience. The love between the two who belong to these families is also told in the prologue. It is also being told to the audience that if ever the two families would unite together, their unity will be the result of the death of the lovers.