Good for you, Flipper!!
I'm sure since you caught her off guard and she wasn't expecting you to know, be familiar with, or even talk about any such information regarding the Watchtower, and because you delivered these facts in a nice, concerning way, she listened more intently. That glazed look seems to take over when they catch themselves doing what they're told not to do. . ."listen" to any outside information. She may have told her friend in the car everything you said, or maybe just part of it depending on her friend's reaction. She might have even made up a story to her friend to throw her off and that way she can ponder over what you said without her friend being suspicious that she may believe you. We won't know.
When I brought up the child abuse issue with my daughter, I said to her that I hope that the Watchtower is not "still" talking bad about the Roman Catholic Church and any other religions regarding this issue now that they've been found guilty of the same thing. When I said that, she looked at me with a concerned look and she was "listening" to me for a little while before I could tell she was starting to get a bit restless and fidgety because she didn't want to hear anymore. She started to feel uncomfortable when I mentioned that at least a representative from the Catholic Church admitted the crime took place and publicly apologized while the Watchtower denies, makes excuses, and still tries to hide this information from their members. Thanks for the reminder about NBC Nightly News and Dateline programs. I'll have to bring that up too one day on the off chance she might get access to a computer and check it out.
All we can do is continue to reveal the facts every chance we get.