How do you control all of her friends and associates, who probably Do have a phone with a camera. Or a digital camera. Or a webcam.
If your kid wants to post nudie pics, he/she will, and there's little other than good parenting (and even that won't always work), you can do to stop it.
not knocking you, just saying...
Back in my day it was not uncommon to take nude pictures of girls on an old black & white Polaroid instant camera, I remember seeing shoe boxes filled with them. Nothing has changed but the technology people have been gazing at nudes since caveman drawings and I don’t see any thing to impede progress in the future.
Personally I can’t wait for the invention of holodecks, no guilt,t disease or commitments whatsoever, truly zip-less sex.