Some of the hard facts of your situation are probably things you do not want to hear, and I'm sure she has not told you. First of all, she has not been honest with you, if she had been, you two would not have taken your friendship to the point of being a relationship. She knew there was a pivotal catch and absolute condition to her love for you and did not share that with you from the beginning. If she had, you would not be here asking the question you have asked.
She may be a wonderful, beautiful, and a caring person on the outside, that, she may own for herself, but, her inside, her thoughts, beliefs, and overall thinking are not hers, but are owned by the watchtower publishing company. She has not told you that to love her and keep her, you have to eventually abandon your entire family and friends and replace them with hers. To love and marry a JW when you are not one, is asking to completely reprogram your mind to what the definition of love is.
Her parents couldn't care less how much you love her or how great you could provide for her or how well you may treat her. All they care about is how many hours you can eventually spend knocking on peoples doors giving out watchtower publications. That is their main concern in life. To them, handing out magazines means love, life and happiness and eventually a place in a fantasy world full of basketball sized grapes and a job burring all your dead friends and relatives after their loving god kills them all.
To a JW, love means letting your own child die if a situation where they may need a blood transfusion to save their life comes up and then refusing the blood. It also means turning your back on, turning your nose up to, and not even talking to your loved ones who do not agree with the watchtower's teachings. That includes, your parents, children, friends and siblings. Also JW love includes waiting for their mythical god to destroy all of mankind on this planet except for, well, the JW's. They sing and pray about how great it will be when everyone else but them are dead and birds are eating the eyeballs out of the dead carcasses. They also consider love as being involved in every little aspect of your personal life from sex to soup.
If that is how you want to redefine your own definition of love, life, science, religion, family, friends, and what you can or cannot watch on TV, knock yourself out. Who knows, she may be worth it.
One more thing, if you want to see how she really feels about truth, fairness and listening to both sides of an issue before making a judgment, tell her you came here and see what she says. Her reaction will tell you just how completely close minded and brain washed she is. After that, you can judge for your self and have a new perspective on your situation. My suspicions are, she will tell you not to come here and only listen to her and her parent's side. That should open your eyes a bit. That may not be her fault, she was probably raised in the cult and hasn't been allowed to think for herself. They do that with all their kids, thinking for yourself is highly frowned on, just ask her.
Good luck,
Dave