Indeed, but you have to see it. You are not obligated to go looking for it. If you don't look for it you don't see it. Even if you do find it again, no prose

Indeed, but you have to see it. You are not obligated to go looking for it. If you don't look for it you don't see it. Even if you do find it again, no prosecutor would ever dare think of bringing charges on a victim for not reporting her discovery of such images days/weeks/years down the line. But things can go very very wrong whenever kids talk to cops. The story they tell their parents might not be totally accurate. (ie it wasn't some boy. She in fact uploading the image herself.) Tell a false story to a cop and horrible situations can happen very quickly. Scenario B above avoids this by limiting police involvement.