It has already been established that she never used a government e-mail account.
Are you sure? They had “released” Benghazi emails before but none were from her private server. I’ve seen questions about “if” sensitive information was on her private server or if it was only used for non-classified correspondence.
If she never had a state.gov email, or never used it at all, then by default there would HAVE to be classified information on her private server.