She's delusional to the point where I think she must be mentally ill. Like she's believing her own lies, like the affair never happened.

She's put herself in a box. She denied the affair to the investigators, she knows all your emails are being sent up your chain of command, so she can't admit to it.

Every time either of you speaks about it, or the actions you took b/c of it, she lies.

She's sticking to the story she told the investigators. That you made it up. That you slandered OM and WW.