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I don't want to advocate manipulation but asking questions concerning Joseph's dishonesty about polygamy to his first wife and his marriage of other men's wives and marriage of a 14 year old may prove more fruitful than just saying wow polygamy is messed up. It will definitely take patience to work through any of this with her but it sounds like she's a pretty awesome person.
The bottom line is that you are setting yourself up for difficult times ahead.
If this is the case, she definitely can be reprogrammed and awakened.
Ask her rhetorically if she would dump her religion for her true love.