[2] Koekkoek was a midfielder at first for FSV Frankfurt, twice reaching the final of the German championship, emerging victorious in 1986.
Her team lost 3–1 to SV Bergisch Gladbach 09 on June 30, 1984, in the Frankfurt Stadion am Bornheimer Hang, but they won the championship title on June 28, 1986, in the stadium on Paffrather Strasse 5–0 against the same team they lost to two years earlier.
On June 28, 1987, with TSV Siegen for the third time, she reached the final of the German championship, which was won 2–1 against their previous club.
As a player on the select team of the Hessian Football Association, she won the final of the state cup on April 15, 1984, in Barsinghausen, with a 2–0 victory over the select team of the Middle Rhine Football Association.
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