As an everyday player, Petras appeared in all games for Grand Rapids (110), as part of an infield that included Betty Whiting (1B), Alma Ziegler (2B) and Doris Tetzlaff (3B).
[6][9][10] By 1946 Petras was a popular figure in Grand Rapids, where she made many close friends and received fan mail, which included a proposal of marriage.
Grand Rapids, managed by Johnny Rawlings, advanced to the final series after defeating the South Bend Blue Sox in the first round, three to two games.
Then, in a tough pitcher's duel, Grand Rapids' Mildred Earp beat Anna Mae Hutchison and the Belles, 1–0, to clinch the championship.
[6][13] Petras opened 1948 with the Chicks, but was dealt to the expansion Chicago Colleens during the midseason, as the league usually switched players as needed to help new teams to be competitive.
An enormous crowd attended her last game in a Chicks uniform, and she felt heartbroken to leave her loyal fans and the close playing relationship formed with second bagger Ziegler.
In 108 games, Petras posted a combined .218 average and a .321 on-base percentage, driving in 32 runs and scoring 59 times, while stealing a career-high 86 bases to rank seventh in the league.
[7] Besides this, in 2002, during the Women's Equality Day, Petras and fellow AAGPBL player Jane Moffet were honored by New Jersey Governor Jim McGreevey prior to a Trenton Thunder minor league baseball game at Mercer County Waterfront Park.
[18] In 2011, Petras participated as a panel member and keynote speaker for Women's History Month celebration at Bergen Community College.