Don't give up hope completely. It may just be a matter of finding the one thing that she's clinging to. Everyone has their points of doctrine or culture or whatever that are important to them personally and the rest is just like a bullfighter's cape - it only serves as a false target for you and doesn't impact their faith even a little.
Or it may just be a matter of piling on the straws until the camel's back breaks. Either way, there's always an ounce of hope. As long as your marriage is working, keep trying to live a genuine life for yourself and hopefully (probably) she'll eventually be caught in your wake.
Asking questions doesn't always work. Even though my wife woke up, asking questions made her upset. She said I was being condescending by asking questions. She said it felt like I was trying to teach her.
We might be married to the same woman.