Your wife is going to feel even more betrayal even if you go find another church to talk about her. Why dont you talk to her direct, sit her down air your concern, and tell her how you feel and whats upsetting you that she is currently doing or done.
that way you are keeping it between yourselve's and learning to listen and hopefully compromise with each other to overcome the matter that bothering you. At the same time, praying into the situation, and asking God for his wisdom and right things to say. without outside your home about it.
If however that you cannot talk to her, then I suggest that you pray that God will put forward someone who you can talk with, and give advise or help in the matter. again the less people involved the less aggro into the situation. and that way people on the outside won't be inclined to listen in other people's dirty washing sort to say. Therefor the situation won't be a huge wide spread problem for everyone to get involved in.
What ever the situation is, if you or both you and wife can trust God, that he can bring calm and peace in the situation. then God will bless you both. I hope and Pray that you both can sort it out.