Though intended to cheer up family members, the unflagging optimism of 4-year-old Shelby Cooper has served only to exacerbate the financial stress her parents have experienced since her father lost his job two years ago, sources reported Monday. It used to make me smile when shed say, Dont worry! Youll get a million dollars! said Ken Cooper, admitting he has since grown to dread his daughters good-luck nose kisses. But now when she crawls onto my lap and tells me I shouldnt be sad because Im the strongest Daddy in the whole world, it just makes me feel like an even bigger failure. At press time, Shelby was coloring a picture of her mother, who when reached for comment said drawings of her leaving the hospital on a rainbow only made her worry more about how the family would pay for her cancer treatments. 