She states that women in horror films are defined by bodily fluids. Society is horrified by women’s bodily fluids and shames women for the release of their own bodily fluids.
The Exorcist features a scene where Reagan urinates on herself during her mother’s dinner party. After this shameful act her mother takes her into the private space of the bathroom to clean her up.
Later, when Reagan is possessed by a “demon”, she takes ownership of the perverse pleasure in her bodily fluids. She stabs herself in her vagina and bleeds from it, symbolizing menstruation. The reason she takes pleasure in this is that she realizes that her sexuality is a very powerful weapon. This is the reason men and women shame young girls in horror movies, because they want little girls to be terrified of their own sexual “powers”.
In Carrie, the first time we see blood is when she begins menstruating in the high school gym showers. The other girls laugh and throw things at her while she cries on the floor. Other girls are even indoctrinated into shaming their female peers, which shows how the powerful notion of repression is valued in society.
Later, after Carrie discovers and embraces her “gifts” (the awakening of her telekinetic powers coincides with the awakening of her sexuality, as demonstrated her attendance at the prom with a boy), she is ostracized further by her peers and mother. As the film culminates with the events at the prom in which a vat of pig’s blood is poured over her head, the entire auditorium laughs at Carrie. This time, however, instead of sobbing as she had done previously, Carrie embraces her otherness and takes perverse pleasure in the degradation— just as Reagan had in The Exorcist.
These young girls discover they have immense powers that frighten others so much that unless they are forcefully kept repressed the girls turn into beasts and monsters. After they deal with the initial shock and embarrassment of being exposed, they embrace their “sinfulness”. Once they’ve embraced those innate characteristics, others can no longer hurt them. In fact, the girls will turn their powers against their tormentors. Then it’s over for them.