Schneider and her daughter lived in the town of Lafayette. New reports said she was being charged as an adult under state law related to the incident on October 30, but the case could later be transferred to juvenile court.
The girl appeared in restraints in Chippewa County Circuit Court for a bond hearing Monday.
Treu turned himself into the Chippewa Falls Police Department at 4:33 p.m. Saturday. Haylee's mother, Sara Jo Schneider, 32, was with the Girl Scout troop and was also hit and killed, officials said. He told police he saw the people in the ditch picking up trash wearing highly visible reflective vests.
The 11 charges filed against Colten Treu include four counts of vehicular homicide and four counts of a hit-and-run resulting in death.
"Our hearts are broken for the girls and families of the Girl Scouts of the Northwestern Great Lakes", CEO Sylvia Acevedo of Girl Scouts of the US said in a statement Sunday.
Police questioned one adult and three children who were present at the day care center.
Authorities have identified the three Girl Scouts and a parent killed after they were struck by a pickup truck along a rural Wisconsin highway.
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Lake Hallie Police Department Chief Cal Smokowicz did not specify in his release what chemicals Treu admitted to inhaling before the crash.
Schneider's mother, Judy Schneider, said her daughter and granddaughter's deaths are "still not real for any of us", and her 6-year-old grandson, Jasper, can't grasp what happened. Another 10-year-old remains in the hospital in critical condition.
Treu was huffing an air duster, according to prosecutors, and when the passenger noticed Treu veering, he corrected the steering wheel. He is jailed on 13 possible charges, including homicide by intoxicated use of a vehicle.
The Girl Scouts out on the highway that day were all fourth-graders at Halmstad and Southview elementary schools in the Chippewa Falls School District.
The fatal incident was similar to one in September, when Treu crashed his auto and police found methamphetamine and THC in it, Newell said in court. The 21-year-old driver, Colten Treu of Chippewa Falls, sped off but later surrendered.
"It's not such a good morning for Chippewa County", Kowalczyk said to open a news conference about both matters.