Sarah Meltzer, 100, of Sun City, Ariz. and a native of Auburn, died Friday, July 11. A celebration of her life will take place in Sun City, Ariz., at a later date. Donations in her memory may be made to the Hadassah Medical Organization, 50 West 58th St., New York City, N.Y. 10019 or to Temple Beth-El, 3980 Sonoma Springs Ave., Las Cruces, N.M. 88011.