She enrolled in College of New Rochelle where she was elected freshman class president and Mission Queen as a senior, played basketball and softball and was a member of the student council in 1953–1954.

In 1981, Seidler was named secretary of the Dodgers Board of Directors in 1981, continuing in that role through 1998,[1] when the O'Malley's sold the team to Rupert Murdoch's News Corp.[2] On the 50th anniversary of the opening of Dodger Stadium, April 10, 2012, Seidler threw out the ceremonial first pitch.

[1] In 2012, Seidler and O'Malley both joined efforts to buy Dodgertown, the Dodger's spring training facility in Vero Beach, Florida, until they moved to Camelback Ranch in Arizona.

They had met earlier that year, during a doubleheader between the Dodgers and the Philadelphia Phillies at the Los Angeles Coliseum on May 4.

[6] They had ten children together, including Peter Seidler, who was the principal owner of the San Diego Padres until his death in 2023.