Maybe I missed it, but did she report the rape to the authorities?
Some rape victims are afraid to report it.
In other cases, the rape victim reports it and the cops may ask her if she wants to press charges and rape victim will decline. Why is that?
Well, part of the reason why is they are afraid of the perpetrator. And, their safety is likely not guaranteed if the perpetrator wants vindication.
Another reason they don't report and don't press charges is because for some reason they feel ashamed, probably because it is a crime that's sexual in nature. Another reason is if/when they report it they feel like they are "re-living" it.
So, I don't know where your co-worker is on that.