Because she received the questions a week before the debate.
Clinton Received Debate Questions Week Before Debate, According to Sources
Definitely tipped-off.
As reinforcement of that notion we all noticed NO hesitation from The Witch on ANY of the questions, NO contemplation. JUST SCRIPTED RESPONSES. Nothing impromptu or spontaneous. Hitlery was a Robot, a programmed Machine.
No one -- especially no one in her ill-mental/physical condition -- could possibly have been that prepared and rehearsed for questions she supposedly did not know beforehand.
Hitlery did nothing but smile like The Joker when Trump hit her with impromptu responses and charges. Her response: Glazed-over creepy frozen clown-smile.
She was presumably explicitly instructed NOT to engage Trump under any circumstance and remain silent during his counter-attacks (as Lester Holt ran adequate interference for her, or cut short Trump's riff.)
The lasting impression of the evening was Hllary's creepy frozen smile-mask and her smugness. NOT endearing. And it did NOTHING to advance her un-likeability factor.