(By Mark Washburn, mwashburn@charlotteobserver.com) Limelight and shadow is the story of her life. Fantasia Barrino, recovering Wednesday from an aspirin overdose (several news sources are reporting that she was released from Carolinas Meidcal Center-Pineville Wednesday night), has long been a creature of extremes, though the latest chapter in her saga is among the darkest yet.