[hocus pocus]

It can take a while for people to come to terms with being raped, and for that reason, I think it is better for your friend to tell people when she feels she is ready. Telling people can be hard if you haven't yet accepted it yourself and everyone is different when it comes to how long that takes. The only time I'd suggest telling someone about your friend is if you think she is in danger, whether that's harming herself or if you think someone is going to harm her again. In the meantime, I think you should try to support her however you can.