Here's the difference typed right out of Divorce Remedy for you :
Make sure your therapist has received specific training in and is experienced in marital therapy. Too often, therapists say they do couples therapy or marital therapy if they have two people sitting in the office. This is incorrect. Marital therapy requires very different skills than doing individual therapy. Individual therapists usually help people identify and process feelings. They assist them in achieving personal goals. "How do you feel about that" is their mantra.
Couples therapists, on the other hand, need to be skilled in helping people overcome differences that naturally occur when two people live under the same roof. They need to know what makes marriage tick. A therapist can be very skilled as an individual therapist and be clueless about helping couples change. For this reason, don't be shy. Ask your therapist about his or her training and experience.
Asking your wife to go to Ret or FT is equivalent to pursuing... It just stiffens their resolve to leave.
If her mother can do it that's great, but I don't reccomend you press the matter with her...
But my main point here is to make sure this is a FAMILY THERAPIST... You mentioned earlier IC... NEVER SEND your wife to IC.... She is WAY TOO INVIDIDUALISTIC MINDED ALREADY