In Illinois can a juvenile be questioned by the police without parent or guardian?

My 15-year-old daughter was forced to write a statement against me. I was not present nor was my ex-wife present during this questioning. I was cuffed and stuffed already and her mother was never contacted. The only adult present was the "victim". My daughter told me she was scared and intimidated because the "victim" and the police were telling her what to write in the statement so she did it to get them off her back. Any advice?