OP,it is interesting what you said in your second post on this thread. I am wondering if your wife have had plenty of experiences in this relationship where her words were turned against her.I mean you said that's what she thinks and she keeps quiet in order to avoid incrimination ,her words used against her.You explained her behaviour away.It is good that you have an insight into it.So, If this is what her past experience is,then this is her defense mechanism. In her view best communication is no communication.