Sec. 2. As used in this chapter, "collaborative care agreement" means a voluntary agreement that:
(1) is signed by the department, a guardian ad litem or court appointed special advocate participating with the consent of the youth, and the older youth;
(2) is approved by a juvenile court under this chapter;
(3) includes provisions required or authorized under the department's rules concerning collaborative care services; and
(4) may be amended by agreement between the department, a guardian ad litem or court appointed special advocate participating with the consent of the youth, and the older youth without review or approval by the court.