@RILEY1982,
In the workplace she has to rely on HR. You, nor she, can do much directly...nor should you. If she has denied his overtures and reported him to HR, then the company is on the hook deal with it. If they don't, then SHE has to take the next steps. HR is required by law to investigate and disposition the "claim". She has to work this out with the company. Otherwise, she has to go to the police and log a complaint of harassment and then it becomes a civil lawsuit.
If she is facing legit sexual harassment, there are no ends to your legal recourse. Just be certain you and your mate are true to your word and the situation. HRs don't f around in legit companies. No owner wants to be sued, they act immediately and with legal prejudice. If it's a large company, they will be taking it very seriously.
My point is that I know for a fact that large companies don't f around with this stuff. It's serious and HR will deal with it. If it is a small company, I'm not sure, but she has recourse. It's not great, but she has it. Not saying it's her fault at all.