You did well in what was a very challenging situation. I would stick to questions don't be drawn into their agenda. When she said "so you lied" I would ask "does that concern you?" We all hate to be lied to, is it ever acceptable for a religion to lie or to be economical with the truth to protect it's reputation at the expense of it's members.
The religion lies to the public about disfellowshipping, they say it is a loving arrangement to bring someone to their senses.
They tell the public that JWs do not have to shun it is a personal choice. The elder told you not to talk to someone does that sound like a personal choice? Is it a personal choice when eating with a Df'd person is also a Df'ing offense?
If you can find examples of misquotes from the magazines and have the original article to show the publishers that may also be helpful.
Someone also had a good chat asking the question on how to leave the religion with dignity I don't remember who it was but it is in the archive somewhere. Certainly gives them something to think about.