Handcuffed and wearing a leather restraint around her waist, the girl sobbed as she appeared in Chippewa County Circuit Court on Monday.
Schneider's daughter, 32-year-old Sara Jo Schneider, and granddaughter, 10-year-old Haylee Hickle, were killed along with 9-year-old Jayna Kelley and 10-year-old Autum Helgeson, both of Lake Hallie.
The criminal complaint prosecutors released describe a struggle for the steering wheel between Treu and the passenger in his truck shortly before the vehicle veered off the road and struck the Girl Scout troop working in ditches along the highway in Lake Hallie, a town about 95 miles (152 kilometers) east of Minneapolis.
Chippewa County Sheriff Jim Kowalczyk said that he then hit his head on a footstool and started crying so she panicked and started stamping on his head.
The victims were among seven children and five adults who were working in the ditches along the roadway.
According to Newell, police responded to an emergency call on the afternoon of October 30.
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Neither the girl or the infant were identified in media reports. Authorities had removed her from the custody of her biological parents in September.
6, 2018, 11 charges were filed against Colten Treu include four counts of vehicular homicide and four counts of a hit-and-run resulting in death.
Investigators say Treu and his roommate were huffing Dust-Off, a computer keyboard cleaner, Saturday morning while driving in Treu's truck.
He will be charged with four counts of homicide, Lake Hallie police Sgt. Daniel Sokup said.
Treu and his passenger, who also turned himself in, allegedly told police that right before the crash they "had been intentionally inhaling chemical vapors," also known as "huffing".
Ms Schneider said the deaths of her daughter and granddaughter were "still not real for any of us". They quickly settled on the girl as the prime suspect, said Chippewa County Sheriff James Kowalczyk.