STERLING, Illinois -- A 15-year-old Illinois girl posted "I love you so much mom" on Facebook after allegedly shooting her mother in the head and trying to conceal the body by setting the house on fire.Police say the body of Peggy S. Schroeder, 53, of Morrison was found in a burning home Saturday, about 130 miles west of Chicago. Schroeder's daughter was charged as a juvenile with two counts of first-degree murder, concealing a homicide and arson. Another 15-year-old girl could face charges of concealing a homicide and arson for allegedly helping the daughter.Sheriff's detective David Molina said the second girl admitted the details to her mother, who drove her to the sheriff's department to tell police. They located the daughter, who confessed to the killing.The Associated Press is not naming the girls because they are juveniles.Molina testified in court Tuesday that the daughter was waiting at home July 6 when Schroeder returned from work. The daughter met her in the living room, told Schroeder to put a towel over her face and shot her in the forehead, Molina said. The daughter then texted her friend about what she did and included a picture of Schroeder's body when her friend said she didn't believe her, Molina said.The friend went to the daughter's home Thursday evening and the girls tried to clean blood from the carpet, he said. The next morning the girls moved Schroeder's body to her bedroom floor and covered her with a sheet. The girls then went to a Subway restaurant to get a sandwich when the daughter learned that her father was coming to Morrison. Molina said the girl vomited in the restaurant bathroom.The girls then went to buy more cleaning supplies, he said. They decided to run away and dyed their hair, Molina said, according to Sauk Valley Media.Saturday morning the girls set the home on fire to destroy evidence, Molina said, with the friend setting the sheet over Schroeder's body on fire. The daughter went to her father's house and her friend went home, the detective said.Later Saturday neighbors reported smelling burned plastic. An off-duty firefighter who was in the area broke down the door as the daughter's father drove up to the home and called 911, Molina said.The friend became overcome with guilt and told her mother what happened, Molina said. The friend's mother drove the girl to the sheriff's department Saturday night and the friend told Molina everything and where her friend could be found. The daughter was located at her father's house. Molina testified that daughter confessed everything, including researching children who murdered their parents.Sauk Valley Media reports that the daughter posted on her mother's Facebook page with two heart icons, saying "I don't even know if you can see me right now but if you can I just want you to know you were my best friend. There were so many things I wanted to say and do with you. I wasn't always the best daughter and I'm so sorry. I love you so much mom I just want you to know and I'll never forget you."The Whiteside County Sheriff's Department and Whiteside County state's attorney's office would not release information on the case when contacted Wednesday.An autopsy was done Tuesday but authorities said the official cause of death wouldn't be released until a pathologist's report is complete.The daughter's defense attorney, Jim Mertes of Sterling, said he had no comment on the case but did say that it "will involve continuing and extensive investigation.""My client is a young child and needs to be viewed as the law views her, as a young child," Mertes said.Both girls are in custody at a juvenile detention center in Galesburg. They appeared in Whiteside County Court on Tuesday and are scheduled to return to court Aug. 8.