She wants the Kingdom Hall wedding because any other venue for the wedding will be forbidden to other JWs to attend, even members of her own family. Family members who do attend will be punished in one form or another
It sounds like you have experience of this happening, which I obviously dont. BUT, I have never heard of JWs being punished for attending a wedding between a witness and non-witness. I've been to weddings in Catholic Churches for members of my husbands family and none of us were spoken to, possibly gossiped about, but that I can take!
She probably wants a kindgom hall wedding because that's what she's always dreamed of, being married to a 'brother' in sight of Jehovah. She doesn't want to scuttle away to a registry office and do it on the quiet and who can blame her.
I have known many couples where one is a witness and one isn't that work out ok, not fabulously, like any marraige between people that have very different beliefs or experiences. But I dont think it's quite the doom and gloom that so many prophesy!
In saying that.. if she wants you to get baptised first before you get married, I would think VERY Carefully, as once baptised you can of course be dfed and you might find yourself without the girl and any possible children..
Poppy