And MIL has the wrong idea here... The point is to get MIL to SPEAK her mind... not to assess how much IMPACT that will have...
Let me put it this way...
Suppose you are committed to run a race... but you aren't sure if you will WIN... do you NOT RUN because you aren't SURE if you will WIN?
isnt the point of making the EFFORT most important here?
Her MOTEHR should be WARNING her.. Even IF your wife IGNORES the WARNING the MOTHER shoudl still TRY and do the EFFORT
This "I wont' say anything because I don't think it will stop her" is an EXCUSE to AVOID an UNCOMFORTABLE SITUATION ONLY
Yours is the same thing...
You know the call to the CO is uncomfortable so you would rather try to threaten OM again to see if he backs down.. and if he offers to back down YOU get to avoid an UNCOMFORTABLE EXPOSURE situation...
All of this nonsense is to avoid doing the HARD STUFF
Your WIFE is doing this with the MARRIAGE
Secret sex chats online is a LOT EASIER than having an UNCOMFORTABLE SITUATION with a family therapist isn't it?