Back when I practiced I had several clients come to me with the same story: My daughter is at home crying because she got drunk at a party and now there is a topless photo of her on facebook/youtube/email etc. We had the image taken down but it keeps popping back up in reverse-image searches. To these clients I offer two scenarios:
(1) Pamela Anderson's approach: Sue the internet. Bring lawsuits against every platform where you find the picture. Everyone in town will hear about this. It might make the news. You daughter will probably change schools. She will likely have to testify or record a statement describing the impact the sharing of these images have had on her. She will need to talk to the police at least once, perhaps many times. For the next several years her life will be interrupted by this issue again and again. It will define her life as a teenager.
(2) The "what's best for my daughter" approach: Only go after those incidents where her name is attached. I, your lawyer, send a note to the platform and they remove the image. If necessary we get the boy who took the picture to sign over copyright and I get the image added to the platform content management engines. It might be uploaded again it but won't be associated with your daughter's name. Your daughter never has to involve herself with this again. Unless she is trolling deep in amateur porn forums she will likely never see the image. It will be lost into the constant churn of a thousand other images uploaded every day. Net result: It will not define her life.
(Yes, this might well be an illegal image of an underage person, but enforcing that law isn't the responsibility of the victim or her family. Once it is reported to authorities the victim is under no obligation to hunt down copies all over the internet.)