Your own feelings may make it difficult to be supportive of the survivor. Sometimes it's hard to find the right words to express caring and empathy. A hug is a good start. I'm glad you survived. It's not your fault.
Sexual abuse takes away the victim's power and control.
Afterwards, the survivor should be allowed to be in control and to make her own decisions. Even if you don't like the decisions she makes, and even if they're not the choices you would have made, you can best support her healing by supporting her decisions. Many survivors blame themselves for the abuse. Tell her over and over again that no matter what she did, it was not her fault. No one asks or deserves to be raped.