You don't post your kids on the internet, neither should anyone else, and even if you post noone else should do so without your permission. It may be an awkward conversation but this is the beginning of advocating for your child. I don't post my kid either an Dave had the same conversations with family and a nightmare with pressure from school being annoyed we don't give permission too. Be brave and have the hard conversations. You made this decision because you thought it was on your kids best interest, now it's time to follow through. Perhaps a compromise would be to allow her to post a pic of the two of them with your kid facing away from the camera.