We've got fries!" squeals sophomore Leigh Jacobson, tearing into her family's living room with a Dairy Queen bag in hand and her sister Elizabeth in tow. The two girls can't stop giggling (about a cute boy), and Leigh rushes over to give her dog Annie a big nuzzle. "Lately," she reports, "I've been having a string of good days."
Her afternoons haven't always been so carefree. About a year ago, Leigh began feeling "down in the dumps." A diligent student, she stopped doing her homework and, instead, slept or cried away her evenings. She drifted from her childhood friends and started...