Let's face the fact that most girls like guys with $$. Most JW girls I know are very nice and most of them do like $$.
You have to get the girl from attending the meetings gradually, take her out during the meetings hours. This could be a very hard task, if she is a pioneer, then you will have to pretend to be spiritual. Always pretend to be spiritual when you are around her JW friends. I suggest learning some scriptures; this could takes many months. Do not let them see you alone with the girl.
If you don't have that much patient, simply turned up to her house, get on your knees, takes out a big diamond ring and popped the question and if she says no then she is not the girl for you. It is better to find out early than to find out late.