Not necessarily. I'd guess the government was going to try her whether she talked or not because he crimes are so serious and there's so much publicity surrounding it all. If say her later was/is negotiating for better outcomes for her if she talked, I'd bet no trial was just never on the table to begin with. But they could negotiate for her to be at a better prison for her sentence, for less time, or some other deal that would make her time being served be easier for her in some way if she helps lead the government to convictions.