HARTFORD — The state Supreme Court ruled Thursday that a Windsor Locks teen is not legally mature enough to decide against life-saving chemotherapy. The unanimous decision, after a 75-minute hearing, upheld a lower court ruling that the state can force treatment for Hodgkin´s lymphoma on the girl, identified as Cassandra C. The state Department of Children and Families had been awarded custody of the child, who is "doing well" with chemotherapy at Connecticut Children´s Medical Center, a lawyer for the state told the justices. The court Thursday heard arguments from lawyers for Cassandra and her mother, Jackie Fortin, who supports