Gender: girl
School:
School #7A
The names are very similar, and the year of birth is correct for the age of the children in school #7A. It seems to be a relatively uncommon surname.
Krause Mirla is born 1928 and has the same street address as Hessa, so very likely her older sister. Moszek was born 1902, making him 29 when Hessa was born, and also in the same apartment - a good match to be their father.