Remember the old warnings from WT about how "brothers" could be innocently browsing the internet or reading email and a popup window for a porn website would just mysteriously appear and "brothers" would instantly close down their computers (about 15 minutes later). It never happened to me, well, not until I actually went looking for porn.
Maybe this has happened to her. She was searching for muffin or sausage recipes and these porn websites just mysteriously appeared.