Here is what I think happened. Until now the strategy was to delay the investigation until after the election. Apparently recent polls panicked the Clintons and so Bill needed to tell Lynch to wrap up the investigation now. Hence a few days later Coamey meets with Hillary for 3-1/2 hours. No way you could do a thorough investigation with only a 3-1/2 hour interview of Hillary but they certainly had to do some kind of interview and so they did what they needed to do to justify wrapping it up.
THE FIX IS IN!!!!!!!!!!!!!!!!!!!
That meeting was pro forma. Just to get her on record answering, or not, questions regarding the specifications for the charges (if any).