Irony is a cruel mistress. The most recent election is still very fresh (some might say "raw") in everyone's minds. We all still remember the chants of "lock her up!" from the tRump supporters. Republican politicians held numerous hearings with testimony from recently fired FBI director James Comey and Clinton herself. The upshot of all of it was that some emails weren't correctly marked as "classified" and made their way to her private server (which - btw - was never hacked).
Nonetheless, it was a source of controversy for her campaign, and she was painted as "crooked", untrustworthy, and cavalier with state secrets. These myths were picked up, amplified, and promulgated by American and Russian media, and tRump made hay with them at his rallies. It likely wasn't the only reason she lost the election, but it played a big part in the narrative - again, primarily from the tRump campaign.