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Continuity mistake: The morning after Vivian's first night at the hotel, room service brings breakfast. When she's eating a croissant it cuts to a shot of Edward, and when it cuts back to Vivian she's eating a pancake which goes from being half done, to being a whole pancake again. (00:30:55)
Answer: There were no details other than Vivian's family was dysfunctional, and her abusive mother mistreated her by frequently locking her in the attic. Presumably, she left home as soon as possible. She turned to prostitution because it's more profitable than a low-wage job.
raywest ★