Be there as much as you can and encourage her to either call a hot line or go for counseling. She has been badly treated. She needs to be nurtured. Let her know she is not to blame. This is crucial.
Many rape victims blame themselves.
She needs to be reassured that the rapist is to blame, she is not. Be patient and understanding. Everyone has her own timetable for recovering from rape. Do not impose one on the victim. Respect her decision if she decides not to file charges.