After finishing the movie and once Caroline's screams died down, Asher went to check upon her. He used the spare key that he had for Caroline's room and opened the door slowly, careful enough to not make a noise just in case she was awake.
But she wasn't.
Caroline was still asleep because of the drug that he had added into her food and wine. It would keep her asleep and trapped in the nightmare until it's effects start fading away and there are no more traces of the said drug left in her system.
Asher found satisfaction in seeing his sister crying, sobbing, and writhing on the bed as if she were in immense pain. She deserved all this for all that she had done in her life. This was nothing but her punishment for all the crimes that she had committed in her life.