Horror Short Film Prompt: The Glitch in the Mirror

[Style] Pseudo-documentary (Vlog Style), hyperrealism, fixed camera shot feeling, natural light, with a touch of suspense and horror. 
[Duration] 15 seconds 
[Protagonist (remember to upload reference image)] A sexy young woman preparing to wash up and go to bed in front of the sink in her bathroom. 
[00:00-00:06] Shot 1: Normalcy. Scene: In front of a large ordinary bathroom mirror. Action: The protagonist is brushing her teeth in the mirror, mouth full of foam. She makes various funny faces at the mirror while brushing (winking and grimacing). Key Detail: At this point, the reflection in the mirror is completely normal, and the movements are synchronized. 
[00:06-00:11] Shot 2: The Glitch. Action: The protagonist finishes brushing her teeth, spits out the foam, and turns to leave the bathroom. Climax (Core Highlight): Just as the protagonist's real body has turned and left the mirror frame, the “reflection” in the mirror surprisingly **does not move**! The “reflection” remains in the brushing posture, even smirking and winking at the camera, staying for a full 2 seconds before suddenly “flickering” in panic to catch up with the body's movement and disappear. Director's Note: Must create an extremely realistic “network lag” feeling, giving the reflection a sense of independent consciousness. 
[00:11-00:15] Shot 3: The Punchline. Action: The protagonist, who has reached the door, seems to sense something is wrong and suddenly turns back to look at the mirror. Result: The mirror has completely returned to normal, empty, reflecting only the opposite wall. The protagonist looks bewildered and scared, glances around the room, and shows a look of horror. The scene freezes on the protagonist's confused face (horror movie effect).