If you are direct with her and she knows you're trying to keep her from becoming a JW, you will be setting yourself up for failure. Potential converts are warned from the beginning that "the world" and "worldly people" (i.e., non JW's) will oppose her so-called faith. The above advice of others as to where to start doing research and their advice about being supportive of her should be heeded.
Most JW's are people who feel somehow disenfranchised. Do you know what her issues are? Does she feel alienated from her family? Is she struggling with economic woes? Try to find out and help her with whatever her issues are.
Best wishes. Thank you for your concern for your friend.