Why is she not in prison (part 1)?

In response to FBI requests for classification determinations in support of this investigation, US Intelligence Community (USIC) agencies determined that 81 e-mail chains, which FBI investigation determined were transmitted and stored on Clinton's UNCLASSIFIED personal server systems, contained classified information ranging from the CONFIDENTIAL to TOP SECRET/SPECIAL ACCESS PROGRAM levels at the time they were sent between 2009-2013.

USIC agencies determined that 68 of these e-mail chains remain classified.

In addition, the classification determination process administered by the US Department of State (State) in connection with Freedom of Information Act (FOIA) litigation identified approximately 2,000 additional e-mails currently classified CONFIDENTIAL and 1 e-mail classified SECRET, which FBI investigation determined were transmitted and stored on at least two of Clinton's personal server systems.

From page 2 of the just released FBI report.

So, not only did Hillary Clinton have confidential through top secret/special access program information on her PRIVATE, unsecured email system but that system was made up of at least three different servers over time.

Additionally, because the FBI was not given (granted?) access to all of the mobile devices and computer components associated with Clinton's personal e-mail system, the FBI can not say whether or not those systems were hacked.

There is this (also from page 2):

The FBI did find that hostile foreign actors successfully gained access to the personal e-mail accounts of individuals with whom Clinton was in regular contact and, in doing so, obtained e-mails sent to or received by Clinton on her personal account.

Also, it appears that Hillary used at least three different systems (over time) as her "e-mail server".

Apparently the last of the servers used was not encrypted to make it easier to trouble-shoot.

Out of the 8 (yes 8, not one as she said) different mobile devices that Clinton used during her tenure as Secretary of State, she and her lawyers were unable to locate ANY of them to turn over to the FBI per their request (pages 8 and 9 of the report). My guess is that (like the Whitewater billing records) they will turn up shortly after the statute of limitations.

I am just getting into this report so there are likely more "gems" to be found. Based on the above information, why is Hillary not in jail?