There would be no immunity, if she doesn't have something they want.
Mills tried to use attorney-client privilege to avoid testifying about Clinton's email setup. It was laughable, because she wasn't Clinton's attorney during that time -- she was a staff member working for the State Dept. But, the FBI let her get away with it.
However, attorney-client privilege doesn't protect an attorney if the attorney participates in a criminal act. I'm guessing that someone else (Combetta?) rolled over and implicated Mills. So, they've got the goods on her, and that's forcing her hand.
The question is: will Mills now roll over and implicate Clinton, instead of shielding her?
Cheryl and Huma would DIE for Hillary, but they won’t have to since Coney has given EVERYONE immunity, next will be Hillary to go after the Platte River guy!!! no sarcasm.