Skeletal Decay Horror Transformation

Cold green horror color palette. Woman in reference overly terrified, shaking, heavily sweating and cornered in elevator crying. Nun-like figure hold her from throat below chin.
As the lights flicker, woman skin gradually changes color. Pale gray skin becomes sickly yellow. Yellow slowly turns dark green and decayed. Veins become visible beneath the skin. Her eyes sink deeper into their sockets.
Strands of hair begin falling away from her head. More hair drops to the floor with each flicker of light. Her face rapidly deteriorates. Skin tightens over bone. Cheeks collapse inward. Nose decays away. The face transforms into a skeletal corpse-like skull. Cracks spread across the skull. Fine dust begins escaping from the fractures. The entire body slowly breaks apart into drifting gray powder and ash.
The soul (white cloud) disperses into the air and inhale by nun-like figure completely, leaving only belongings of woman at elevator door border that stops door from getting close. Cinematic supernatural horror, realistic decay transformation, unsettling atmosphere, slow terrifying progression, highly detailed, realistic lighting, psychological horror film style.