The daughter of Bolesław I and his second wife, Ofki (Eufemia) of Mazovia. Around 1450 she married the Hungarian Palatine, Władysław Garai, who became a supporter of Matthias Corvinus towards the end of his life and died young in 1459. References to Aleksandra being alive can be found in documents from 1463. She bore Władysław Garai two children; a son, Job, and a daughter, Anna.

(K. Jasiński, Rodowód, vol. 3. p. 175, S. A. Sroka, Polacy na Węgrzech, pp. 15, 23-24, 152, V. Fraknoi, Matyas kiraly, passim)