Comment: My understanding

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My understanding

of it is that she made an opening statement proclaiming her innocence, then took the 5th.

I'm not a lawyer, but the objection is that you can't tell only your side of the story then clam up and not subject yourself to cross-examination. If you're going to plead the 5th, then you just basically shut up, or say at the most that you're pleading the 5th. Her problem is she proclaimed innocence.