When writing the answer, the ideas that were likely considered include:
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Her giving orders to Steve instead of asking him to behave a certain way: This shows her lack of respect for him and indicates a dynamic where she feels superior, which reinforces the idea that she has doubts about his innocence.
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Her concern that he will not take the case seriously: This reflects O’Brien’s perception of Steve and adds to the notion that she does not believe in his innocence or capability.
The description of O’Brien before the dialogue could also provide context, but the focus seems to be more on her actions and words during the dialogue itself. Thus, the first two points are the most relevant.