There are three levels to this.
Level 1 - mishandling of classified info
Level 2 - public corruption/money laundering (Clinton Foundation nexus)
Level 3 - espionage - my bet is that she was a) selling classified info outright; and b) altering our foreign policy to satisfy “donor” demands
The first two could garner her some serious jail time, but hat last one she can fry for.
While I'm complete agreement with Hillary being guilty of the first two levels, I'm skeptical that she's guilty of this third level of criminality.
Instead, I'd suspect Hillary's faithful "companion", Huma Abedin, of committing actual espionage. She is very likely an agent of the Muslim Brotherhood and her position gave her an excellent opportunity to compromise our national security.