Your sister thinks she knows a lot about the Bible, because they have drilled her in it. But her Bible translation is very poor, and deliberately wrong in many places.
The worst place is in translation John 1:1, in which they claim that it shows Jesus as just another mini-god, not the Real God. In trying to prove their false translation, they misquoted a well-known author, which deeply offended him. Here is his resonse:
Julius R. Mantey (click here), the famous author of Greek Grammar texts, shows how poor her New World Translation really is.
Otherwise, if you do not really know your Bible, simply refuse to talk about it or hear about it at all. Just get into chatting about old, good times that will get her mind back onto relationships with her family, not the JWs who want to drive a wedge between you.
Golly; just like a MORMON!