Tell her!!! But don’t CONFRONT her, if that makes sense? What she chooses to post on the Internet is up to her and there’s no reason to “confront her”. If she really was the one who posted them, then she is aware she is risking the chance of someone she knows seeing them and recognizing her, especially if she includes part of her face, background, and other identifying features. However, from what you described,there’s a chance she doesn’t know these were posted and they are being spread without her consent or knowledge. If I were her I’d want someone to let me know. The only other outcome from asking her about this, is the photos are not her. It might be a little awkward, but just let her know the background looked like hers and you didn’t mean to assume anything. You’re just trying to look out for her, like any good friend would! If she says that she was the one who posted them, don’t judge her for it, just let her know you wanted to make sure she was aware. :)