I too have a non-Orthodox wife. I have the deepest respect for her retention of her RC position. Yes, perhaps if I am totally honest, I would be delighted if she became Orthodox, but I have to say I will never attempt to pressure her in any way.
It seems to me that that would be achieving the change for the wrong reasons. I feel that she should not come to the OC because I am pressuring her or making her feel somehow guilty just because we have two different takes on Christianity. If she is to join us it has to be because it is correct for her, and what she wants to do without any coercion. Of course, I pray for her constantly, and would be so happy if she converted. But I recognise that we need to allow the Holy Ghost the opportunity to influence her. My influence is restricted to the example of OC practice and explaining things when she enquires about it.
Perhaps if she was not Christian it might be a different story, but she is, and it isn't!
Maybe this is off topic for marriage, specifically, but it raises the question of how we go about drawing people into the OC, and maybe missionary activity in general.
With love and prayers,