Visible crew/equipment: After the failed shopping trip, the manager takes Vivian to his office, and lifts a chrome pot to water the plant. The film crew can be seen in the reflection on the pot. (00:42:40)
Visible crew/equipment: Early in the movie we see Edward on the phone talking to Jessica. As Edward says "goodbye Jessica" we can see the reflection of a camera crew member squat down to the floor. This can be seen near Edward's right shoulder.
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.
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