Siedzikówna was born on 3 September 1928 in the village of Guszczewina, near Narewka, in the Bielsk Podlaski district.
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Danuta Siedzikówna grew up with her siblings, Wiesława (1927–2004) and Irena (1931? - 1978), in the forester's lodge near Guszczewina (when were exiled Wacław they moved to Narewka), the girls attended grammar school in Narewka until 1939.
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She was charged with taking an active, violent part in an attack on functionaries of the Communist UB (Polish secret police) and the Milicja Obywatelska near village Podjazy as part of the Łupaszko unit, despite the fact that she was only a medic.
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Danuta Siedzikówna (nom de guerre: Inka; underground name: Danuta Obuchowicz; born September 3, 1928, Guszczewina – died August 28, 1946, Gdansk) was a medical orderly in the 4th Squadron (created in the Białystok area) of the 5th Wilno Brigade of the Polish Home Army.