I really love her and she's my best friend but being paranoid all the time about this its starting to really get to me.
Are your intentions romantic? Do you want a future with her? If so, you have only two choices:
Choice 1) Convert and be a JW, either for real or for appearances. Either way, your life will be nothing like it is now. And no matter how wonderful she is, no matter how gorgeous, a girl is not worth either becoming a JW or faking being a JW for the rest of your life.
Choice 2) Get her out. Some have already commented on how to help her do this. This would be the best thing for her in the long run. It's true that you may lose her friendship in the process, but as some have mentioned, even if you shake up her faith a little, she will be in a better state than before, even if she shuns you.
The very best advice is to read as many comments on this forum as possible. There are so, so many insights here. And there is not one single post on JWN that would ever make you decide to make Choice 1! You'll read about those of us who are "in" simply to continue relationships with husbands or wives or moms or dads or thier kids. You'll read about people who would love to be in your position - out of the organization with thier family in tact. There is absolutely nothing good to be gained in this religion.
Good luck.