You are way too young for any of this.
The fact is she hasn't been upfront and honest with you so far so why is that going to change if you continue a relationship with her?
She also hasn't been considering your needs, especially from the intimate side of the relationship. Not exactly fair for a young man your age.
She's pulled in two directions and hasn't exactly gravitated towards your side. She's putting herself and the fear for her mother before you. None of these factors are a good bedrock for a budding relationship.
Guilt and fear are dictating to her now and this is not going to change in the future either, even if she is disassociated.
Oh, and if you are wise, don't show her this web site, or any other anti-JW site for that matter. It won't have the weight you think it might. It will just mean that Satan is now influencing you to break her faith. Don't even mention you have been looking on these kind of web sites.
Best of luck to you.
Edit: Have just seen that my last point has already been covered by bohm. I do apologise.