klayerjimi wrote:

I would like to keep tabs on my teenaged daughter’s internet access. As
a teenager she is curious and eager to know about many things, which
are not right for her age. I cannot exercise direct authority on her as
this leads to friction between us. How can I keep a watch without her
coming to know about it?

If you don't want to be a responsible parent then don't. Just what are
you going to do should you find you she is visiting inappropriate sites?
That'll just cause more friction and you are desperate to avoid that.