the thing that puzzles me the most about this... out of the MILLIONS of porn/smut websites, just how in the heck did they find her on one particular site??? how did they know where to look??
They were a group who does actually look for children so they know what websites to look on.
And the even the non-government FRS is pretty good. It would harvest a group of people for you to look at.
Once you have that it just takes looking at them one by one until you get a match.