Well done BM.
When she asks what you've read you might respond with "nothing outside of WT literature". And you can quote page and paragraph with the help of jw facts and folk on this site.
As you know there is enough in WT literature to show they don't have the truth. Just all the quotes about "The generation of 1914" and especially the difference and inconsistency between the recent RC "shun and don't pick up the phone video" and the FAQ's on jw org entitled Do Jehovah's Witnesses Shun Former Members of Their Religion? (Look under FAQ/About us/Practices)
And not one word comes from outside sources.