The fact that she set out to circumvent all the security in place is cause enough to question her judgement. That she was aware as well is obvious, but for some compelling reason she saw fit to sustain business as usual.
It is completely possible to argue that she thinks that the law of the land simply does not apply and that advice to the contrary is a mere inconvenience.
After all, a truly corrupt operator never deals directly but uses a willing agent who never writes anything down. Welcome to China. It is possible that she simply could not give up control of even that much.
The trouble is that the only rational for her behavior and the evidence at hand is corruption covered with plausible deniability which only a lawyer could love. All too smart by half.
Could this ONE email guarantee a Clinton indictment?