She was possessed until the priest fucked her
The world revolves around the possible. The impossible is only impossible until it happens and then it is no longer impossible. Therefore, anything we imagine can happen, just by imagining it, can happen. That explains how this girl is the victim of an evil spirit and not just because she has seen it in a classic movie. That doesn’t matter, since the important thing is that as soon as the priest fucked her, she stopped being possessed. It seems like it had to do with her pussy or having a cock stuck somewhere in her body. That, my dear perverts, we will never know.