From the information provided, it can be inferred that Ama felt the name was "cool" because she was younger. 12 years later, now a lady, she feels it is derogatory because she is now matured.
When deductions are made from a text based on logic and the information provided, one is said to have made an inference.
Thus, we can correctly stated that among other things, Ama got upset because the conditions of things has changed and she had outgrown the nickname.
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