Also whilst planning, and i had worked out my costumes i wanted to have a practice makeup session to work out how i would show the variation in looks between the two personalities and the two different looks, for the normal personality and her as a murder.
This first look would be the look for when the girl is herself in her normal day to day look. 
And this look is for when she is the ghostly killer, still as the same character but showing the two personalities.