If they ask her "why didn't you hang up? Why did you keep going out with bill to restaurants to tolerate the harassment? Why did you keep listening to this stuff?"
I'm betting she will say because she felt compelled to be nice and put up with it because she feared losing her job or suffer in some way at the job if she didn't put up with it, but it too far when he kept specifically asking for sex. When your boss asks you to get donuts you do it. You don't talk back to, act rude etc. to the boss. He also has the power to turn it around on you and make you look like the bad guy and get other employees at fox to make your job unpleasant or uncomfortable (everyone ignores you like you have a disease etc.). She decides to just leave the situation entirely instead of rocking the boat.
Next they will ask, "why didn't you complain to fox management?"
She will probably say something like, "I feared they wouldn't take the matter seriously because he is the star of foxnews and brings in good ratings. I thought they would do little to punish Bill and I would be the one to be removed from the situation to another department, or get rid of me, never advance, things like that."
Yup -- where I used to work (multinational consulting firm), the partners were basically small gods. They would run around and harrass women all the time; when women went to HR, they were told a report would go in the partner's file, and that was it. In the meantime, depending on how vindictive the partner was, the harrassee's career path would suffer.
You can say "just leave" -- but isn't that like telling someone whose neighbors are being burglarized to "just move?" The behavior that needs to change is the perp's.
That said, it's not yet clear what happened here. I just disagree with everyone who pre-emptively blames this woman even assuming O'Reilly *did* harrass her.