I’m not sure how they can prove things like personal rent came from campaign funds unless she wrote it on a campaign account check. More likely than not, they are making assumptions. The bowling outing and expenses on gas could be considered campaign expenses depending on the details behind it. Even part of rent could be if she used her home as a campaign office, but it would have to be expensed on the back end; that could simply be a bookkeeping error on her part.
According to O’Donnell herself, the home she is currently sharing with David Hust is paid for by her campaign and doubles as a campaign offices. She says she is subletting part of the home as living quarters from her campaign. So if her campaign is the official tenant of the home she lives in, she needs to have clear records showing that she is reimbursing her campaign as a sublessee. And there’s no evidence that she hasn’t kept such records.