This is a new porcelain/ plastic mask Jolie stole from a theater as in to hide her face from the victims 

It unhinged to reveal his mouth and her pupils are visible to those looking at her with the mask on. She also often wore this to school but rarely opens her mouth there. It made with a special material that can be drawn on and wiped off like whiteboards. She doesn't wear it around those she comfortable with although hate when someone draws on it without her permission