Relatively little is known about her. Primary sources are limited to a few mentions by the chronicler Jan Długosz, and inscriptions from her ceremonial tombstone. Her exact date of birth is not known, nor is the exact order in which Casimir children were born. She never married, nor did she enter a monastery in her youth. This was most likely due to the fact that her father, on his death in 1194, had not yet decided upon her fate.