I feel so bad for you!
It is sad to say but you have been given an open door and I would use it and run like Hell. You do not say how old you are. If she has been a pioneer all this time and a JW she knew better. You will continue to take the fall for the lapse in her non-JW behavior, and even if you were able to marry, you may pay the price for this courtship for the rest of your life.
You also made the statement about being her head. Yikes, that is a scary.
I would suggest moving on. It is the best thing for you. Decisions to become invovled with a very controlling religion for someone you love rarely works out. Especially when you have been given the "heads up" before hand...(she dumped you because the religion said so.) Do not carry on and get to the point where children are involved and you have a change of heart about the religion.
I know this must be difficult to hear, but until she volunteers to leave, you will never be able to measure up to this religion in her mind. It will be one sick road for the rest of your life.