Mary C. Sanders, 43 of Littlestown died Fri Feb. 17 at the Gettysburg Hospital. Born June 23, 1968 in Gettysburg, she was the daughter of the late Preston J. and Hilda S. Breneman Sanders.   Mary was a 1987 graduate of New Oxford High School and had worked at Hanover Hall, Winter Gardens and most recently The Brethren Home Community. Mary attended the Gates of Praise Worship Center in Littlestown. She loved country music, all animals and reading books. She is survived by a sister, Helen "Betsy" Walker of Waynesboro, PA.   There will be a Memorial Service Wed. Feb. 22 at 7:00 PM at Gates of Praise Worship Center, Littlestown. Burial will be at the convenience of the family. Contributions have been asked to go in Mary's Name to Gates of Praise Worship Center, 5010 Baltimore Pike, Littlestown PA 17340. Little's Funeral Home is in charge of arrangements.