The police questioned the adult and the three children who were in the daycare center when the crime happened.
"She stated she was holding the child and that's when she dropped the child". One additional 10-year-old is still in the hospital, but they say she is reported to be in stable condition. Judy Schneider said her 6-year-old grandson doesn't understand that they're gone.
Treu appeared in court via closed-circuit television Monday.
Two small groups of Girl Scouts and their adult chaperones wore bright green safety vests Saturday as they walked along both sides of County Highway P, which they had adopted as a community service project.
The other charges Treu faces are for felony bail jumping, intentionally abusing a hazardous substance, and causing "great bodily harm" during a hit-and-run because another Girl Scout in the group was injured.
The traffic crash claimed the lives of Jayna S. Kelley (age 9) of Lake Hallie, Autum A. Helgeson (age 10) of Lake Hallie, Haylee J. Hickle (age 10) and her mother Sara Jo Schneider (age 32) from the Town of Lafayette.
Investigators say Treu and his roommate were huffing Dust-Off, a computer keyboard cleaner, Saturday morning while driving in Treu's truck.
Neither the girl or the infant were identified in media reports.
Though Judy Schneider is grieving the loss of her daughter and granddaughter who were killed in an alleged hit-and-run in Wisconsin, she said the two "needed to be together". Authorities said she had been removed from their home and placed in foster care.
Police say they were hit over the weekend when the pickup veered off a rural highway in Lake Hallie as they collected trash along a rural highway and then sped away. Girl Scouts sang songs in memory of the victims, who were members of Troop 3055.