Authorities said she had been removed from their home in September and placed in foster care.
Treu was being held in the Chippewa County Jail on 13 possible charges, including four counts of intoxicated use of a motor vehicle, Chippewa County Sheriff's Sgt. Robert Jensen said. Another 10-year-old, identified by her mother's Facebook account as Madalyn Zwiefelhofer, remains hospitalized in stable condition.
The girls were collecting trash next to a rural highway over the weekend when a pick-up truck hit them.
Nine-year-old Jayna Kelley and 10-year-old Autum Helgeson, both of Lake Hallie, were also killed.
A 10-year-old girl has been charged with killing a six-month-old baby boy at a daycare centre.
- The driver involved in a deadly hit-and-run crash with a Girl Scout troop that was picking up trash on the side of the road in Wisconsin Saturday is now facing charges, including homicide.
Treu and the unidentified passenger of the vehicle both turned themselves into different police departments later Saturday afternoon.
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The accused was accompanied by her biological parents in court, where Judge James Isaacson ordered her to be detained on a $50,000 (£38,280) cash bond. A passenger in Treu's truck told police he grabbed the steering wheel when he saw that Treu "looked out of it".
On Sunday hundreds of members of the community gathered together in the rain in honor of the victims of Troop 3055 and sung Girl Scout songs during the candlelight vigil.
The baby hit his head on a stool and started crying, Newell said, and the girl panicked. He said he saw people in the ditch wearing highly visible reflective vests. "He said, 'If the doctors work real hard, sometimes God lets them come back'".
Haylee also enjoyed painting and working on clay pottery with her mother. The 21-year-old driver, Colten Treu of Chippewa Falls, sped off but later surrendered.
As a western Wisconsin community grieves the deaths of three Girl Scouts and a parent who were struck by a pickup truck, authorities still haven't released the names of the victims or a fourth girl who survived.
Each homicide charge carries a maximum sentence of 40 years in prison.