Photo Kristin Schultz
Isabella Sementilli doesn't let a debilitating headache disorder keep her down. She bakes and sells cookies at her family's restaurant, Scotti's, and donates the proceeds to brain injury and anti-bullying causes.

Teen turns chronic pain into a mission

BY KRISTIN SCHULTZ Gazette Reporter SCHENECTADY — Isabella Sementilli looks just fine. She is a petite, dark-haired 14-year-old girl with a bright, beaming smile. Silver bracelets jingle on her wrist. She loves Nancy Drew mystery novels. Isabella Sementilli looks just…