Mentalclarity puts a finger on an important point; it is a matter of enormous pride which a JW holds internally that they would die for their faith. Pride equates with valuing something and can have a positive feedback even if its actually delusional.
This is related to the fact that JW religion compensates for other things which people find missing in their life.
A witness might think "I have a crummy job and delinquent children but I have the promise of everlasting life if I remain loyal to the org". Religion is a private anchorage point in an unstable world for many people. By bringing to the surface the questionable nature of her beliefs it is likely you are threatening your wife's imagined ticket to paradise and she will perceive it as you trying to deprive her of that vital emotional anchorage.
By you stopping following the JW nonsense it will only make her ten times more determined, and I speak from experience as I think I may have mentioned in an earlier post.
Therefore If you value your wife, I would suggest you quit the criticism of her faith and look to see if you can see why she so desperately clings to the 'certainty' of JW beliefs. It may be something you can help her with, for example the inability to recognise that we all without exception die. Does she fear death? Perhaps it's related to not having some other things in life which she is missing out on such as self confidence, the lack of which leads to depending on the religious claims of others. Self confidence and self fulfillment are subtly if not overtly suppressed in JW thinking. By helping her develop her own identity and confidence in her own abilities she may feel less inclined to rely on the org.
I know its easy to say things and a lot harder to resolve deep seated emotional and psychological difficulties and differences-- but if there are genuine good intentions, a common goal or at least common ground to start with, progress must be achievable.