Leona Helmsley is concentrating on doing good works while appealing her tax fraud conviction. The hotelier, nicknamed the Queen of Mean during her trial in New York, has promised to send a $10,000 check to Kerri Kelley, 12, of Wollaston, Mass., in response to the girl's letter seeking money for eye disease research to help cure her visually impaired grandmother. "If this girl can devote such time and energy, Mrs. Helmsley felt she could help out," Helmsley spokesman Howard Rubinstein said. The letter to Helmsley was one of 24 Kerri sent to companies, celebrities and politicians asking for pledges to the Eye Research Institute of Boston in hopes of helping her grandmother, who suffers from muscular degeneration, the leading cause of blindness among the elderly. Paul Procter of Procter & Gamble pledged another $5,000 to Kerri's cause.