One thing we can tell her is the whole basis of Not Just Friends. Starting down that road, even in a friendly, professional relationship, is filled with danger.
I know that lots of people can be in an environment like that and never have anything bad happen. But we know that the best intentions, that the strongest moral convictions, that even religious beliefs, can weaken to the point where they crumble.
Like I said, every situations is different. But what I said is the story that the people here can share with her.