WEST STOCKBRIDGE, Aug. 2. Garrett F. Troy, manager of Troy's Garage baseball team, has Miss Jackie Mitchell, the national ally-known girl baseball player, left-handed pitcher, to play with the Garagemen. She has struck out Babe Ruth and Lou Gehrig in past performances and is rated a high class pitcher. Jackie will make her first appearance for the Troy Ga rage nine against the Copake Falls All-Stars on Labor Day morning in this town when the game will start at 10.30. Miss Mitchell is 20 years of age.