Suspense
You can see this by the the setting of the excerpt.
<em><u>oil</u></em>
Natural resource which made Ghana a prosperous kingdom is gold. This country had abundance of gold, since it literally sat on the gold mine, and its rulers used it for many years of successful trading. Therefore, the kingdom became powerful and prosperous. In some periods even dogs in Ghana had golden collars, and Ghana's kings were among the richest men in the world. They traded gold for salt (mostly with Arabs) which was very important for people's health. Today, Ghana is the second largest gold producer in Africa.
Sophia's intelligence would rely on the people who adopted her, and what they and others have taught her.
However, one can argue that IQ isn't entirely accurate when it comes to intelligence. For instance, emotional intelligence is not a factor when determining that score.
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