We "overpayed" for her and everyone knows it. Getting taken advantage of is kind of the opposite of putting pressure on another country to make them do something that's a crap deal for them.
Depends on optics. This is controlled by executive branch and if they want portray themselves as hard on corruption, they’ll do it. You’ll see this on Americans arrested overseas. If it makes the media, the executive branch will flex its power. Just happened today with the basketball player caught with drugs in Russia.
US swinging its dick around in that manner over one dude who ran one fraudulent company isn't worth it for the US.