Then, it's 2000 all over again. She'll contest the election with the media cheering her on.
Frankly, I'm more worried about that, than fraud. Fraud takes a lot of people working in concert, and only one honest man to take the entire operation down.
With a contested election, Hil->liary only needs to yell "we wuz robbed!" and all of her sycophants in the media will take up the hue and cry and run with it. Mob rules, there's no coordination necessary.
You want a Civil War? That's how it might happen.
Many Americans are armed.