[1][2] She was a well-traveled pitcher during her five-year career in the AAGPBL, as she moved constantly from one city to another because the league office shifted players to help teams stay competitive.

Almost six feet tall, Frances played basketball and organized softball while attending Gilboa High School.

At a second tryout in 1948, she was accepted and assigned to the South Bend Blue Sox for a couple of days before being sent to the Grand Rapids Chicks.

She also led her Colleens team in pitching and had two one-hitter shutouts against Springfield at ballparks in Oklahoma and South Carolina.

[1][3][6] Janssen spent the entire 1952 season with Battle Creek and was used in relief duties, a seldom used role in the league.

[4][1] Janssen was an assistant researcher for AAGPBL archives at the Northern Indiana Historical Society, of which she was an active member.