She gained access through the use of accomplices. Penalties for such a thing should be increased. That might serve as a deterrent. Tampering with surveillance cameras in connection with a federal election should be a felony.
It might also help to appoint individuals who will publicly affirm -via affidavit- that to the best of their knowledge no monitoring equipment was tampered with.
I don’t agree with the need for paper ballots, since that is an additional step that can also -theoretically- be subverted. You can print out a million paper ballots and then hand-count them, or you can query the election machine to see what the totals are. Since both processes depend on the same root information, you will always have the same result.