NVR:
... she stubbornly refuses to engage in any discussion regading the WT organization in fear that it will lead to an unfavorable conclusion.
You could always try quoting scriptures and let Mrs NVR draw her own conclusions. You aren't critical of the Organization™, just the people who make claims about being Jesus' true disciples.
"I wonder if that's what Jesus meant when he talked about having love among yourselves? Would our next door neighbors recognize that as being true disciples of Jesus? Just thinking out loud, honey..."