Golden oppurtunity, maybe you have to much to loose though.
Since she is already using the internet, why not direct her to "apostate" sites under the pretense of showing her how rediculous the claims against jw's are.
The use terrible logic and overall poor reasoning to defend the jw's. Meanwhile compare it to other religions with similar problems to show how silly your "their" argument is. The point is to get her to defend and investigate the "apostates".
Just and idea as Ive found reasoning and arguing to be a complete waste of time. If it works and she takes the bait, go from being a brave defender of truth to uber paranoid about elders who dont want you to even dare to discuss such matters.