I would ask her to look at the photos she took and think a bit about how can those be traced back to her. I hope she left her face out, and if she did, is the background the same as photos she has already online? Can she erase any picture she has online (Facebook, instagram, etc.) that could be used to prove she is the one in those photos (same background, same furniture, etc.)? Beside this, you can reassure her it's not the end of the world, as people age it becomes less of a problem, and if she's your age, the threat of it being child pornography can shut up any loud mouth, and it can make it easier to take them down any site they end up on. So, overall, tell her she can totally deal with this and survive it.