Nuance, my friend. Waiver is a really fact specific determination. You have to have voluntarily given potentially incriminating evidentiary testimony (that is, testimony about facts) for there to be a waiver. It's not at all clear that she testified as to any factual matters at all. If I'm advising her, not giving that two paragraph introduction would have clearly been the safer play, I'll say that up front. But you're listening to someone trying to sell you a bill if they have told you that it's cut and dried waiver.