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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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.