Have you tried witnessing to her from the bible?
JW's readily admit that their message is quite different than what the apostles preached. So, how can they expect to escape this judgment:
But though we, or an angel from heaven, preach any other gospel unto you than that which we have preached unto you, let him be accursed. Gal. 1: 8
It sounds like she is feeling sorry for you while imagining her own superior religious position. However, it is you who should be displaying your sympathy for her as one who will fall under the judgment above. I would repeat this scripture over an extended period of time until it starts to sink in.
Also, how can she expect to grow to perfection in the New World when the bible clearly states: Therefore by the deeds of the law there shall no flesh be justified in his sight - Rom 3:20 ?
Other scriptures the JW's desperately need to hear:
...it is appointed unto man once to die and then judgment - Hebrews 9:27
But we are all as an unclean thing , and all our righteousnesses are as filthy rags; - Is 64:6
As it is written, There is none righteous, no, not one: - Romans 3:10
Three times Jesus says you must be born again or you cannot see or enter the kingdom:
Jesus answered and said unto him, Verily, verily, I say unto thee, Except a man be born again, he cannot see the kingdom of God.
Nicodemus saith unto him, How can a man be born when he is old? can he enter the second time into his mother's womb, and be born? 5 Jesus answered, Verily, verily, I say unto thee, Except a man be born of water and of the Spirit, he cannot enter into the kingdom of God. 6 That which is born of the flesh is flesh; and that which is born of the Spirit is spirit. 7 Marvel not that I said unto thee, Ye must be born again. - John 3: 3
Doesn't your wife want life in the kingdom? Why is it then she is being disobedient to Jesus? Why is she choosing to not believe God?
I would tell her that if she wants to live her life under the curse of Galatians 1: 8, she is free to do it; but you are just too afraid of this scripture to change the Christian message over what was preached by the apostles.
Man up and lead your house.