I would assume this question refers to Mandy’s style of acting. I have never seen she or anyone else describe what kind of actress she is, but based upon some things that she said in the DVD commentary, I would have to guess that she is what is called a “method actress.”
When she had the really emotional scenes, she had the director give her something to think about and she would go off in a corner to concentrate on it to get her in the mood (she did not elaborate on what this was). This resulted in some realistic and POWERFUL scenes.
“I do not need a reason to be angry with God!”
Shankmen revealed that after these scenes where they did this he needed to release her for the day because she needed time to get it through her system and get back to normal.