I don't know how you keep from dishing it back in her face when she gives that b.s. about it affecting her son. Just goes to show how she can twist things around, doesn't it? You are the big bad man who FORCED her into an affair. You heard her blame it on you, and until she feels remorse for what she's done......she will continue to find justification holding you responsible for everything bad in her life.
She obviously was searching for something she thought could be in one of those bedrooms, if no other rooms were disturbed. Let me ask you, is there anything in the past that she could use as blackmail to prevent you telling son about her little affair? I get the feeling she was searching for something that had been stored away for some time. But who knows what was going through her crazy mind at the time.
When she was rattling off all the things she had done that you had ask (regarding ending the A), she failed to mention ending contact with OM.......even if she had to leave her firefighter's group. Have you made that perfectly clear to her?
She gave you her passwords, etc. Does she know you can access her phone activity? I mean, she was trying to sound as if she had ended the A and everything else you had wanted, but not a word was said (from either of you) about her continuing to meet and to talk with OM.