The black 15-year-old, identified by her middle name "Grace", has been in juvenile detention since May.

"I miss my mom," Grace reportedly told the court on Monday. "I can control myself. I can be obedient."

But the judge said detention was in her best interests for now. The case has sparked protests and claims of racism.

Judge Mary Ellen Brennan said the teenager had been benefiting from a residential treatment programme and was not yet ready to return to her mother.

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