It seems like she wanted to believe her boyfriend and keep her relationship going. I don't understand her behavior. I know what my behavior would have been. Cancel the dinner party. Read the text message that my daughter sent my boyfriend on his phone. Ask him to move out until this was sorted out. Take my daughter to the ER, doctor, and therapist. Ask my son has he seen anything unusual. The ending didn't make sense. It almost seem like this was not a movie, but a play. Maybe, that is what it should have been. The whole movie felt unfinished. You never got any answers. The film just ended. Dumb movie.