She has steadfastly avoided any statement to an official agent until last weekend. She knows she can lie with impunity to the camera, and the Enemedia will give her a pass, maybe after an emphatic scolding.
I think the transcript of her "voluntary interview" would be very interesting. I suspect it was repeatedly "I don't recall", and if confronted with a public statement that was proved to be wrong, she simply said "I apparently mis-remembered".
I doubt she actually took the 5th, as that would be like waving a red cape in front of the bull. But, I don't think she said anything substantive.
I wish it was within the power of Congress to compel the release of her "interview".