tl;dr...but based on your question you want to do things slow. Don't burn a bridge if you don't have to. I think especially when you are raised a JW you are hardwired to convince people that YOUR opinion is right. So when you figure out you don't want the JW's anymore you automatically want to convince people that they are wrong and you're right. So you end up with two totally opposing forces with neither one really willing to give any slack. undercover had some good advice.
If you do decide you need to give her some of your thoughts be sure to do it in a way that will make her ask the question. Make it seem like you don't understand certain rules but aren't outright saying they are wrong. Pose questions to her that will make her ask questions.