A Plano woman found not guilty by reason of insanity in the 2003 drowning of her two daughters is now mentally stable and can leave a state hospital, a Collin County judge ruled Thursday. State District Judge Mark Rusch signed the order releasing Lisa Ann Diaz from Big Spring State Hospital in West Texas after a little more than two years. Judge Rusch said Ms. Diaz must remain on medication and continue treatment on an outpatient basis.