Not just in prison, but essentially solitary confinement. She is not a criminal. There are no charges against her. She has not been convicted of any crime. She is essentially a ward of the state. She has been put there by the Department of Children and Families. She is there even though there are families willing to take her in.
This child's life has been a living hell of rape and violence, and some bureaucrat has decided the only way to deal with her is to treat her like the worst kind of criminal. This person (The Commissioner of the Department of Children and Families) needs to be publicly shamed and forced to resign. She has no business making decisions about human lives.