I am her mom and she is an adult who does not live with me and I am worried about what could be the downside.
If she’s not nude, don’t worry about it. There are about a quintillion pictures of scantily clad girls on the net.
Just make sure she understands that their is always the chance of a serial killer out there that just likes her type. Posting much about yourself on the net is never a good idea, just for general principles..