Gender: girl
School:
School #8B
I'm nearly certain that her mother is Dworja, because they have the exact same addresses as her and her brother, and she has the same deportation date.
Considering that the AG note is either a change of address or a deportation, likely to Chelmno, I think that Estera was deported to Chelmno. Primarily because the AG date is the day of a Chelmno deportation. Although I think it is possible it's a change in address, I think that it is most likely that she died at Chelmno.