Blackmail her? What would be the point? She can’t be accused of any wrongdoing. The media wouldn’t stand for it, and the prosecutors wouldn’t prosecute. The Congress, no matter who has the gavel, would never impeach. She’s Hillary.
There’s no need to blackmail HRC. It’s far better to let Bill give a speech or two for $500K and capture some sort of metal mine or other contract worth $100 MM. These are 100:1, 200:1 returns.