Gender: girl
School:
School #8B
Of the three results for Zelda Sieradzka that came up, only one was born in the right age range to have attended school #8B.
Only one Sieradzka matched the same address as Zelda, and it was of a mother/sister/cousin Pesa (b. 1910). Because of the age difference (21 years) between Pesa and Zelda, is is hard to tell what kind of family member Pesa was. They were both deported on May 10, 1942, on which date there was a deportation to Chelmno.