Listed at 5 ft 2 in (1.57 m), 134 lb, Dailey batted and threw right-handed.

[1] Mary Dailey played for three different teams in five different transactions during her two seasons in the All-American Girls Professional Baseball League.

Originally an infielder, Dailey entered the league in 1950 with the South Bend Blue Sox and was dealt to the Peoria Redwings during the midseason.

After opening 1951 with Peoria, she returned to South Bend and finished the year with the Battle Creek Belles.

She was a .162 career hitter over 114 games, while posting a 1–0 pitching record and a 6.02 earned run average in 15 innings of work.