For purposes of addressing the problem of children remaining in psychiatric hospitals beyond medical necessity, a child under 18 years of age who has been diagnosed with a serious mental illness or serious emotional disturbance and has been reported to, or is at risk of being reported to the Department of Children and Family Services Child Abuse Hotline as a minor at risk of custody relinquishment shall be eligible for emergency access to the Specialized Family Support Program for 90 days for purposes of stabilizing the child and family, preventing a psychiatric lockout, or custody relinquishment that leads to a hospital stay beyond medical necessity.