I figure I'll give her some time to defog some before pushing for more.
She will never "defog" as long as there is contact, even business contact. If there is no legitimate business reason for them to have contact at work, then she should seek employment elsewhere to minimize the chance of contact with the OM if she is serious about working at the marriage. The fact that she won't go to MC alone, however, shows that she's not, and she's only playing you.