This is something your friend has to fight back.

A lot of people here just have fun with their easy life. So never mind whatever they say. You have to fight sometimes. I believe this is something your friend has to fight back.

As far as your friend has evidents that the prosessor seduced her, she can sue both the professor and the university. She will have a good chance to win. There are quite some attorneys free at the beginning and will only take a percentage cut when they win the cases. Just call around and find out a good attorney. In the meaning time, tell your friend to keep a valid visa status. There are many ways to do that. Just ask around.

Big cat probably give you much better advices on which leg choices your friend has.