Bay-Regula pitched in 2005 for the Chicago Bandits of the National Pro Fastpitch and was named co-Pitcher of the Year; in 2006, Bay signed with the expansion Philadelphia Force.
As a freshman, she broke into the Oklahoma State Cowgirls top-10 season records in strikeouts, innings pitched and was selected Second Team All-Big 12.
[6] Bay-Regula's banner senior season boasted her fourth All-Big 12 selection, Big 12 Player of the Year and First Team All-American honors.
Bay-Regula would rank top-5 in ERA, strikeouts and opponents' batting average for the season in the Big 12, all of those marks remain top-10 conference records.
[14] The scoreless streak was snapped by the Tulsa Hurricanes when they scored in Bay-Regula's fourth inning of relief, the Cowgirls eventually won that contest in extras on March 26.
[19] At the Tokyo games, Bay-Regula had a win in five innings of work and won a bronze medal after Canada defeated Team Mexico 3–2 on July 27, 2021.
Bay would also vie for the Cowles Cup Championship on August 28, 2005, but was pulled after four innings and eventually lost the title to the Akron Racers.