DOn't ASK her to go to Famlly Therapy... you TELL her that sorting things out with OM for the last few months in secret and now spending a week independintly to decide the fate of her AND you is unfair...
Tell her she needs at least SIX months with a PROFESSIONAL FT and NO OM interference to sort that out... a week is NOT going to help her... and walk OUTO of the meeting
Don't try to negotiate at length.. you offer her a sweet deal and then she takes it or leaves it... NO MORE chatting wtih OM.. it ends THEN and THERE.. not even a GOOD BYE...
If she gives you ANY backtalk you tell her to pack her things and you exit teh conversation...
SHe is TRYING to sneak ino an OPEN marriage man... you have to HIT that HARD... She woudl NEVER tolerate YOU pulling this stunt, so you give her what she would give YOU if you tried to pull this stunt...