I know each home is different, but to me it sounds like Torah Mom does not trust her 12th grader.
I am not advocating giving children access to things that they are truly too young to handle, but the internet has become an integral component of societal functioning, and to deny all access to young adults is essentially an unhealthy form of coddling.
With parents like these, how will young adults, our future, develop the competency to view the world through their own eyes, and not through the eyes of their hovering parents?
A message to all the Torah Moms out there: Trust your children. Trust the chinuch you have worked so hard to instill.