I think it is possible to be a perpetrator and a victim.
Many sex abusers are.
If you listen to the John Sweeney podcast, it is clear that her father, Robert Maxwell, the corrupt media baron, was a terrifying bully, who alllegedly bullied his sons Kevin and Ian and allegedly favoured Ghislaine as the golden child (the yacht he jumped off/committed suicide from was called the Lady Ghislaine). John Sweeney hints that their relationship was close to an unhealthy degree.
Unfortunately, Ghislaine, having lost one bullying majorly corrupt domineering force in her life, switched her allegiance to another.
That's not to say she is not as guilty as hell and we all have free will of thought and action. But she would have grown up with a very skewed sense of right and wrong.
Epstein used Ghislaine and she allowed herself to be used. And she then went on to use and abuse others.