“ They want to trap her into telling them something different that what she testified to under oath.”
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This.
It is exactly how the FBI and other LE agencies on many levels have screwed over probably tens or hundreds of thousands of people over the course of many years - by asking the same question in 10 different ways, looking for the slightest discrepancy, so that they can charge the person with lying to law enforcement as further leverage...or simply to boost conviction rates, regardless of whether the person is actually guilty of the underlying crime or not. This is EXACTLY a why you do NOT talk to the police without your lawyer present, EVER.
I took an oath to tell the truth, the whole truth, and nothing but the truth.
So, go read the court transcripts.
If you try to play the "refused to cooperate" game, I'll sue your ass into next year.