The belief that counselling ends marriages is common and gets the sequence backwards. By the time many couples arrive, they have been in difficulty for years; the counselling is near the end of the story, not the cause of it. Couples who come earlier, as your wife is suggesting, are the ones with the most to work with.
What a session actually is, since the picture people have is often wrong: both of you describe what has been happening, usually differently, and the work is to find the pattern underneath rather than to decide who is right. No verdict is issued. Nobody is told they are the problem.
It is also worth noticing something in your message. Your wife has asked for this. Whatever the counselling does or does not achieve, declining it is itself an answer to her request, and she will read it as one. That is worth weighing separately from your view of counselling.
A free ten-minute call is a low-cost way to see what you would actually be walking into.
This is general information in reply to a public question, not advice about your own situation, and it does not create a client relationship. If you are in immediate danger, contact emergency services.