Again I would like to thank everyone for their comments and advise. It is deeply appreciated. I wish at least one present JW would voice their opinion.
Here's the thing. While there SHOULD be nothing wrong with it, active believers in the Watchtower will not come to this forum, or if they find themselves here, they are supposed to run away with their tail between their legs.
That is because Watchtower controls every facet of their lives. If this girlfriend still believes that religion, even if she gets kicked out (disfellowshipped) because she leaves her husband and marries you, she will go back and be shunned for a long time, she will be shunned by her family for a long time, then she will eventually be reinstated. To do that, she will decide that she regretted all that she did, including marrying a non-believer. Oh, she will still be married to you, but she will regret it. To make up for it, she may try to recruit you.
I don't know her situation with her current husband. I don't know that she should get out of it. I imagine so. But you don't have to be married to her before she figures this whole JW religion thing out. Let her decide if she wants to get kicked out. Let her decide if she wants to be your girlfriend. Do whatever dating people do, just don't marry her until she decides what to do down the road. Give it at least a year. You can live together or date or stay friends, you can have sex or not. But don't get hitched until she knows she doesn't want to go back.
Odds are heavy on her going back unless she left the religion for good reasons, not just left her husband for good reasons. You can work on educating her about the religion and how it's not "the truth." But her family shunning her might cause her to go back one day.
You have been warned.