The law in Wisconsin is that children aged 10 and older can be tried as adults. The MSM articles explain that the initial charge is required although the case could be moved to a juvenile court.
I hope the case IS tried in adult criminal court, with a plea arrangement of NG by reason of mental defect or G but insane, that leads to a psychiatric in-patient institution for this child, with the criminal record in place. Clearly she cannot be allowed in public schools or daycares around other children, cannot be returned to parents or foster care. Juvenile detention until age 18 is possible, but she would not get the intensive help she needs. I think this girl is extremely disturbed.
I would not as adult want to be asleep in a house with this girl. I would not want her near a child of mine. Public safety > needs of indivudual child
who has murdered a baby.
She 1) disobeyed the foster mother's instructions to stay outside and not disturb the sleeping baby, 2) not only disturbed the baby but took him out of the crib another defiant/disobedient act, 3) she alone states that dropping the baby was accidental but it could have been intentional, 4) she STOMPED on his head with enough force to cause death which is murder, 5) she lied to police. I don't pretend to know what is wrong with her, but she's a budding serial killer displaying no respect for human life, disobedience, defiance, violence and dishonesty.
There will not be an easy answer. Law & Order had an episode like this years ago where a 10 year old girl murdered a little boy - 1999-2000 Season #10, Episode #207, "Killerz" - still photos from show at link
"Law & Order" Killerz (TV Episode 1999) - IMDb
The resolution on the show was putting her right back with her mother and outpatient therapy with court supervision. It was very disturbing.