All seem quite plausible, but there may indeed be a more sinister explanation, as null and void incisively and humorously speculates:
Demon possession is very real and very scary to those who willingly open themselves to it. Typically, demons offer supernatural power in return for personal control, and it's long been obvious that Hillary's distinctive and insatiable thirst for power appears to be practically all-consuming in her. Who knows?
No humor was intended...