That's what I was thinking but not sure what that means.
What are one or two things you would do had the voice-recorder yielded definitive results?
Whatever those would be, I would suggest that you DO THEM ANYWAY, because -- c'mon -- you KNOW what's going on here!
As I've tried to advise you upthread, I think your course of action should be to proceed AS IF SHE IS DEFINITELY HAVING A FULL-BLOWN AFFAIR. A reasonable person can draw no other conclusion from the evidence and behavior that you already have.