it seems a little bit my story. I married a Jw almost 29 years ago.
For sure I don't know if Italian Jws are different from other Jws in the world but I seems so..
She is and was always very " liberal" and we raised 3 children, non of them are Jws.
She still goes to the KH but only a couple of times a month and that's it. I would compare her to a non practisant catholic but to be honest I have to admit after almost 30 years of experience that I was lucky and met the right girl.
Since your girlfriend decided to stay with a "wordly" guy it means she is not a fanatic but you should pay attention to her Jehovah-friends and family ....
My wife seperated her " personal " religion fron our family life and everything went well