based on the death of the father and the remarriage of the mother Margareta I believe that Anna is the daughter of Martin von Boldeck
I posted a discussion on the mother the same discussion but also post here in case there are different managers that are interested and have different view points.
I believe based on the bio posted that Anna is the daughter of Margareta von Blanckenfelt's 2nd husband Martin von Boldeck (murdered in 1563) because Marsalk Baltzar von Falkenberg died in 1577. Anna was born in 1560 so based on the bio she would be Martin von Boldeck's daughter.
https://www.adelsvapen.com/genealogi/Falkenberg_af_B%C3%A5lby_nr_105
Baltzar von Falkenberg. Heir to Schönermark, lord of Ermes and Salisburg in Livland. Came to Livland and became a country councillor in Livland in 1547 and marshal with the master Herman von Brüggeney. Died 1557. Married in 1549 to Margareta von Blanckenfelt in her first marriage (married 2nd with Martin von Boldeck, who was murdered in 1563-06-10 at his home in Salisburg by his brother-in-law Frans and Christoffer von Blanckenfelt. Married 3:o with his brother-in-law the horseman of Swedish service Tomas von Boldeck) (At (Sch).), died in 1572, daughter of Polish knighthood in Livland hauptman Frans Joachimsson von Blanckenfelt, to Vollmar and Blanckenfeltshof, and Kunigunda von Tiesenhausen.
