Direct report under HR/security investigation
I'm a first-time manager and could use some advice. I have a meeting with HR early next week about one of my direct reports, and I'm not sure what to expect or how to approach it.
She's currently under investigation by HR/Security after trying to access one of our internal documents using a Gmail account that's associated with her dad's company instead of her work account. Access was denied, so as far as I know she never actually got into the document through that account. It happened on her day off and she didn't report it herself. I honestly don't know whether it was an accident (she was logged into the wrong Google account) or something more intentional. I do have a suspicion that she may have been trying to access it in connection with her dad's work, since he works in a similar area, but I have no evidence of that (yet) beyond the circumstances.
For some additional context, she's been a somewhat low performer and has been a challenging employee to manage for other reasons, but this is the first incident I'm aware of involving something like this.
I'm going to defer to HR and Security on the investigation and whatever conclusions they reach. But from a managerial perspective, how would you handle this?