When she agreed, Bijou told her the gig was prostitution; Bijou then became her pimp, police claim, arranging for her to meet men, some as old as 50, sending her the time, location and dollar amount of each sex act.
Phone records show that in a three hour period on a single night, she was prostituted six times.
The girl told investigators she went along with it because she had no money or place to stay, and thus had no choice.
Prosecutors claim Bijou then brought in two associates: 22-year-old Jeremiah Horenstein and 25-year-old Ashton Lewinson.
They said Bijou and Horenstein took pictures of the runaway and posted them on websites advertising commercial sex acts.
They reportedly would book hotels rooms for some clients, and drive her there in a big flashy white Mercedes.
She was sold to hundreds of men in the space of less than one month, prosecutors allege, earning her the grim nickname.
They also suspect she wasn't the only minor being trafficked by the trio; the runaway told investigators that she participated in at least one prostitution-related sex act with another unnamed 15-year-old.
According to the documents, when Bijou had a falling out with Horenstein, the teen ended up working for another woman: 27-year-old Souprina Blanc.
Under her, she was pimped out to at least six men, usually at Airbnb rentals. It was at one of these rentals investigators finally managed to track her down.
They had suspected she had gotten involved in a sex trafficking ring when, three days after her disappearance, they were shown a text message sent from the girl to one of her relatives saying she'd had sex with "so many people."
Checking her phone records, they discovered she'd been in constant contact with a number listed on numerous online prostitution advertisements.
Miami-Dade Police investigators and the FBI's Child Exploitation and Human Trafficking Task Force set up a sting, surveilling a Miami residence they suspected harbored the runaway.
After rescuing the girl as she left, they moved in on the property and found Blanc in the living room, another naked woman in the bedroom and a naked man hiding in the shower.
Between August and December, Bijou, Horenstein, Lewinson and Blanc were all arrested; they were each charged with sex trafficking a minor, and held without bond. Bijou has already pleaded guilty.
If convicted, all four face a maximum penalty of life in prison.