Why do you think Aunt Jennifer created animals that are so different from her own character? What might the poet be suggesting, through this difference?
In creating animals that are different from her own character, Aunt Jennifer found a means of living an alternate life that is denied to her: a life that is proud, free, fearless and sure of itself. The tigers denote her yearning for power, freedom and fearless living.
Through this difference, the poet may be indicating the prejudices of the patriarchal society that is unfair to females, especially the married ones.
(A model answer has been provided for students' reference. It is strongly recommended that students prepare the answer on their own.)