Since I am not involved with the making of this movie, I can’t speak from any personal inside knowledge.
BUT–I think it is quite likely that the director will use a double for the rape scene, at least for shots that show the body and that involve the rapist touching her.
The double will be a very petite woman or possibly a midget (midget stuntmen and women are very well-paid in Hollywood because they stand in for children during action scenes).
I apologize if the use of the word “midget” is offensive. I think the current preferred word is “small person” or “little person,” but I am only trying to make it crystal clear what I mean when I say double for a child. I am talking about a full-grown adult of small stature.
The facial expressions of the actress will still be filmed, but not in a “rape” scene. The scene would probably be filmed in a very pleasant setting, not on the day that the double films
the rape scene, and the director would probably tell Miss Fanning to “look terrified” or “moan like you’re in pain.” Her skill in making these facial expression and vocalizations would be what earns her the Oscar nomination.
I’m not saying I agree with the filming of this film. I personally think that we have a morbid fascination with death, rape, murder, and other grisly things, and I’m not sure we should feed that fascination. On the other hand, many of us are afraid of such things, and perhaps watching them on a TV show or movie helps us to face our fears and turn them over to the Lord.
So whether I agree or disagree isn’t the issue. I’m merely trying to point out that child actors are protected from exploitation in Hollywood. There are rules that govern what directors can and can’t ask children to do.