According to Monte Irvin, Manley provided the Eagles with an air-conditioned, $15,000 Flexible Clipper bus, a first for the Negro Leagues. Worried about what her players would do for employment during the offseason, she and Abe sponsored a team in the Puerto Rican winter leagues.
Manley served as the treasurer of the Newark chapter of the National Association for the Advancement of Colored People (NAACP) and often used Eagles games to promote civic causes. In 1939, Manley held an "Anti-Lynching Day" at Ruppert Stadium.
Several stories about her have become part of Negro League folklore. One such tale is of her demanding that Terris McDuffie be the starting pitcher for a certain game because she wanted to show him off to the women of her social club. Another had her giving signs to players by crossing and uncrossing her legs to signal bunts.