As has happened in the past, the reason is obvious: political blackmail on a gigantic scale. If she "goes down," she will take dozens, perhaps hundreds of elected criminals, past and present, with her of both parties!
Remember the 800 FBI files that she "accidentally" and illegally kept for over a year?
What is the statute of limitations on malfeasance?
I'll go get the popcorn.
“”Remember the 800 FBI files that she “accidentally” and illegally kept for over a year?””
Those aren’t going to help her now. She has to deal with people who were nowhere near their present positions at the time she stole those.