Hm, that's odd. I'll mention it to the other staff (I don't really work on the main content pages).
Give who a warning? Can you tell me the full username and link me to their profile?
If she's doing something in-PM that's against the rules, then report the PM. Otherwise we have no idea what the content is, and no offense, but we can't really take your word for it; we have to see it ourselves.