If everything you’ve said is accurate, there’s a big problem here. It could be that your wife has developed a dependency on her therapist. She knows that if she doesn’t have any problems, therapy will end. It may be that she is creating more and more problems to stay involved with the therapist. It’s certainly worrisome that there’s something the therapist is giving her that is so compelling she is willing to risk her relationship with you and her family and put you in financial stress to continue treatment.
Yes. By all means talk to your wife about it. It won’t help to “confront” her with anger. Instead, try to have a loving and kind talk about your concern that somehow therapy is going wrong. Ask for a joint session in which to tell the therapist your concerns. Therapy that is based on lies isn’t going to help her or your marriage. Therapy to help her figure out why she needs to have a therapist in her life to such an extent that she creates problems, on the other hand, is important.
Most therapists are quite willing to have a spouse or partner come in for a family consultation as long as the patient agrees. If your wife doesn’t readily agree, it does take the issue to another level. You may need to bring in a third party (like another family member or one of her close friends) to help provide support for her while you insist that the issues be dealt with. It’s unfair to you both for you to cooperate with her deceptions.
I wish you well.