Nah, Arkancide is her only option. Even if she has the evidence, there is no way they'd impeach the First Black President. The blacks would bolt the party, and the Democrat Party would be forever sidelined.
An impeached black president is better than a dead black president -- Obama would be a martyr, much like the Sainted John Kennedy. Hillary will not allow Obama to be loved more than she. She'll disgrace him, not martyr him.