Wow. I wish I had some advice for that situation, but I think you're doing what you can for now. You clearly understand the real problem with Reiki, Applied Kinesiology, homeopathy, astrology, etc.--it's really not falsifiable, because it wasn't any sort of real evidence that convinced her in the first place. If you try to show her that it isn't real, you are dismissed as one of the countless millions who are too "narrow-minded" to understand and not open enough to see the amazing new world she's discovered.
The trouble is, there was clearly a time when she felt you weren't giving her attention, love and respect in the right amounts, and along comes this guy and essentially promises her that she has magical powers and he can help her unlock them. Nothing is actually too good to be true, he says. Let's do a simple test to see if we can't fix your marriage, he says. Oh dear, he says, I hate to be the one to tell you this, but the test didn't go well.
Detaching makes sense. I don't see what else you can do. There's always the chance that she'll come to realize what's going on. The life coach/applied kinesiologist guy in particular sounds like a real piece of work, though, and he's clearly got an interest in keeping her on the hook. Now you want to do the right thing, but you have to be honest. He doesn't and he won't.
I would say you have to treat this guy like the Other Man even if she never has an affair with him. I would treat this like an emotional affair. So the detaching is good. Ignoring him as much as you can and giving her no support for this relationship with him is good, but I'd try not to come off as negative if you really want to keep her. Others who've been through the affairs and the WAW situation will have more advice than that, but you're doing the right things.
Remember that her attachment to him is at least partly a reaction to you and your marriage. It isn't real. It's based on her willing suspension of disbelief, same as any "normal" affair.
