Have you been in contact with any victim services in your city? I think your child will qualify for all sorts of assistance. Support groups for children, therapy.. all sorts of things.
Being 9 is that verge of being a tween. Her body is changing. Friends are very important to them and yet, they can be fickle..
And then to have this extraordinarily strange and horrible event, I do not think there is a "normal" reaction that can be expected.
Having professional guidance will help all of you. Taking it day be day, keeping open communications, giving her the most truthful answers possible. Listening to her concerns, her anger, her fear, her helplessness. It will take time for her to figure out what she needs.
That is why a professional can help.