According to my research on studies conducted by various sociologists, I can say that based on the information provided within the question the anthropologist seems to be experiencing what is known as culture shock. This (like mentioned in the question) is the feeling someone may get when they are dropped suddenly into an unfamiliar culture with a particular way of life or set of attitudes. This may make the individual feel disoriented or overwhelmed.
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The brief summary states that Fiona cares about what her peers think and she adopts their feelings and views because it is all she knows. She's conforming through social influence.
