Put it all on the table: What you expect regarding holidays, birthdays, etc., sexual relations, if she marries you and then starts a heavy campaign to convert you, abandoning you for meetings, assemblies, and all other JWs gatherings and crap.
She might be lovely, mild, and all, but it can go sour quickly if the JW mindset takes over her being. Later on, when children happen, it could turn into an ugly heartbreaking mess.
You will be back here telling us your sad story.
SL