Elliot: That's a terrible story. Whoever organized the event didn't do a good job of protecting the subs (or at least warning the subs what might happen, so they could make an informed choice to go in or not).
I'm not a lawyer, but my guess is that she won't find a DA willing to take the case. It's hard enough to make a conventional rape case stick in court. A rape that happened at a sex club where the sub willingly entered a sexual situation is probably a hopeless case. It would take a VERY openminded jury to convict.
While I'm very sympathetic, I'm not 100% sure I'd convict, honestly, depending on what the sub knew or didn't know before she entered the room. Consent is a tricky thing in situations like that, and the men who used her may very well have thought she had given her consent simply by entering the room. But a lot depends on what the ground rules of the environment were. For example, if there was a set safe word that they ignored, I'd definitely vote to convict. But if the room was a 'no safe word' play room and she knew that, I'm not sure I'd convict, because the doms might have had a reasonable expectation of consent.
Having said that, I'm always upset when I hear stories about subs who were victimized by doms. It's wrong, it's traumatic to the victim, and it makes BDSM harder to do for everyone else.