In 1510, Katarzyna married Andrzej Kościelecki, and in 1515 Beata was born, and in speculation was believed to be the illegitimate daughter of Sigismund I.

Tired of the ongoing fight, she sought a protector, entering into a marriage in 1564 with the voivode of Sieradz, Olbracht Łaski.

When she finally agreed, Olbracht Łaski imprisoned her in the castle in Kežmarok, where he kept her in poverty and strict confinement without contact with outsiders for eight years.

Beata's case became of interest only in 1573, when the emperor ordered the starost of Upper Hungary to conduct an investigation.

This was also influenced by the fact that in the meantime it was revealed that Łaski had entered into a bigamous marriage with the Frenchwoman Sabina de Sauve.