Obama doesn’t know whether to cut her loose or not...or when and in what fashion. Unless he really writes her off, I wouldn’t expect anything negative from him before the election.
BO won’t say anything about Hillary if he’s just as guilty as she is because she’s not going down without him.
Obama’s goal is to be the top dog in the Demo-rat clique in DC. To achieve that, he has Lynch indict her via grand jury after election, before Trump’s inauguration. Then he pardons Hillary with certain conditions 1) neither Hillary or Bill or Chelsea can enter DC without his approval, 2) Hillary & Bill provide him all the FBI files and other blackmail data to his post-presidency staff, 3) A sizeable donation to the Obama Benevolent Initiative.