Yes back off for now.. she very likley is going to get suspeicious that you are just trying to get her AWAY from OM
Let me warn you one thing.. if your wife leaves there then you have no one watching out for her... a lot of fresh new people at a new worokplace and you know none of them so have no contacts tehre..
I would just let her stay where she is if that's what she wants right now... infidelity often dies out like this... something that seemed romantic and exciting becomes ugly, stressful, and something they want to AVOID instead... she's experiencing that now... the gossip, the lies, the exposure... she hates it, but she and OM created this environment.. let her LIVE in that for a while... she needs to LEARN what straying and following other men around DOES... if you tell her to LEAVE and escape she learns nOTHING...
THis is the SAME message you want her to learn about marraige... I would be encouraging her to STAY and REBUILD her reputation there rather than telling her to escape... you arnent helping yourself...