Perhaps an ethical/moral section? I'm thinking from the female perspective here. Stats, science, and history are great, but connecting on an emotional level can have more impact - especially if she doesn't have the educational background to understand all the science stuff. It might be fairly easy for a fellow JW to bamboozle her with JW literature/facts afterwards. A moral/emotional issue can't be gotten rid of so easily. I'd start right off with all the people Jehovah has killed and the atrocities he promoted (according to his own book). How many people has Satan supposedly killed by comparison? If this whole thing is a test to prove we can't govern ourselves, why has he interfered so much (tower of Babel, the flood, "a chosen people", a book of instructions)? It's simply not a fair test. It's like the JW analogy of a student thinking he can do better than the teacher, so the teacher gives him the chance to prove it... but the teacher keeps killing the other students and telling them to follow his own rules (hardly "hands off").
Asking the moral questions in-person in a confused/sincere manner gets you brownie points... Other people are right about the mental shut-down if you lose your "innocent" cover. Perhaps wait with your "innocent" objections until she brings up each subject? Moral quandaries bother the mind for far longer than anything else. I think Jehovah-directed atrocities are the strongest contender for a lasting impression.