While actual lawyers do their lawyerly contemplations, I'll ramble a bit as a non-lawyer.

first, who physically removes her

The courts don't have a lot of control over anything other than their courtroom. So if she were to show up and present herself to the court as the US Attorney for EDVA, the bailiff would be the one to physically remove her if the judge orders her removed. But showing up to the EDVA office is nothing the court can control.

is everything she has done (good and bad) null and void?

That's the suggestion I've heard from places like Meidas Touch. Everything she touched after the determination that she was NOT the US Atty, would be stricken from the record (probably after a motion from the defense to do so).

What I don't know is what happens to things signed by rank and file attorneys in the office. Can they do their jobs - file charges, make arguments, etc - if the US Atty position over them is vacant? Does the entire output of that district come to a halt, or can other attorneys do the work without a US Atty over them?

--Peter