I had heard of Jackie Mitchell previously as a female player in pro baseball, but today I stumbled on Vada Corbus, who was a new one to me. She signed to play with the Class C Joplin Miners of the Western Association in 1931, making her the second female in organized professional baseball. She does not appear in baseball-reference.com. I'm not sure that she ever got into a regular season minor league game, though the Miners carried her on their roster for quite a while. Her signing was announced near the end of April, 1931, and made the newspapers all over the country. She was still with the team on July 7, when the Joplin News Herald reported that she would be making her first appearance in the Miners' lineup that day. The scheduled game was an exhibition between the Miners and a touring all-pro girls outfit.
Vada's brother was Luke Corbus, who played for the Joplin Miners for a couple of seasons and who does appear in baseball-reference.com. The link to his record follows:
https://www.baseball-reference.com/r...d=corbus001lew
Three photos of Vada Corbus are shown below. As can be seen from the middle photo, she was a catcher.