I'm not going to repeat any of the very good thoughts above. And, I, took hope you 'stick around' - for our englightenment as well as yours.
Frankly, most JW women would literally JuMp, JuMp, JuMp at the opportunity to bring someone such as yourself into the
organization. So, that leaves me wondering, also, why?? she hasn't pushed this, since you expressed a willingness to attend meetings.
I think that you aware that if her congregational elders learned of her
'smoking' and the fact that you two have a sexual relationship, she would be disfellowshipped and 'shunned totally' by all - likely even by her own parents!!! As others' have commented on, this makes me question that perhaps she doesn't want you to go to the Kingdom Hall with her, on the chance that the 'critical-eyed' elders would pick-up on your feelings for her.
Put her in the 'spotlight' as such, and then actually 'grill' her about your relationship...and believe me, they would show no mercy. (If you haven't done so, please read JT's "Thong" thread.)
I like Mommy's advice - it would seem that she has doubts on some level - check out some of the recommended sites like Freemind and consider sharing them with her. Start slowly, perhaps with one topic, and see how she responds.
I will repeat some above advice - your life will be dramatically altered if you should marry this woman and she remains adament about rearing her child, and probably any you two might have together, as active JW's. If you had a son or daughter by her, would you want them to miss out on birthday celebrations, Thanksgiving, Christmas, Easter, sports in school, 4th of July parades.....and the list goes on.....?
And think of this potential happening - even if you raised 'your' child as you see fit and she doesn't give you any flack re doing so - what about the child she already has - what a horrible 'conlict' it would cause between siblings. One child so restricted - the other an active participant in normal childhood activities, holidays, etc. Truly, Tex, IMO you must 'force' the issues with her - it's unfair to both of you to let this situation continue as it has.