The simile can be seen in the sentence “Only today I wish I didn’t have just eleven years rattling inside me like pennies in a tin Band-Aid box.”
The metaphor, in turn, can be seen in the sentence “I can't stop the little animal noises from coming out of me….”
In the simile presented in Cisneros' "Eleven", we can see how the narrator compares the eleven years old with the coins in a safe. This comparison reinforces the idea that a person's age is the sum of all their previous ages. This shows the reader that the narrator is aware of her personality construction and the formation of who she should be over the years.
The metaphor, in turn, compares the girl's cry with the sound of animals. This shows how desperately, wildly, gutturally she cried, like a small child.
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