Is there anything more specific that makes you think there is an OM? Snooping is generally frowned upon here. Most will advise you not to. ...
There isn't anything specific, just a general feeling of ~how could she feel this way if there isn't another~. But I'm going with the advise not to snoop now (that post was from 6 months ago)- everything I did in the past to snoop turned out very bad without confirming suspicions.