There are some real great videos on YouTube about the concept of Jesus in the old testament and some great debates between Muslim and Christian scholars about the diety of Christ. They are not anti witness or evangelical in nature. Just straight about academic theology.
If she is not a baptize yet try and convince her to take a look. Once you start placing it together as long as you are sincere in your bible study, it makes it really hard to take the wts very serious.
Unfortunately most are just social clubwitnessed. Even the ones who cry and say don't you love jehovah.