[2] She was forced to retire in October 2022, following a series of injuries which restricted her to nine appearances for her German club Turbine Potsdam since joining them in 2018.

[3] In December 2012 Smidt Nielsen made her senior international debut as a second-half substitute for Pernille Harder in Denmark's 5–0 win over Mexico in São Paulo, Brazil.

[4] She was selected in national coach Kenneth Heiner-Møller's Denmark squad for UEFA Women's Euro 2013.

[5] Karoline's mother Lone Smidt Nielsen (née Hansen) is also a former international footballer, who played professionally in Italy.

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