Gender: girl
School:
School #19A
Searching for 'Hantkam' under fuzzy parameters, I came up with Zelda Handkam, who was born in a year appropriate for her school and for her to have signed the album.
Moszek (b. 1901) and Ruda (b. 1906) are likely Zelda's parents, and Hana (b. 1929) and Abram (b. 1935) her siblings. This family was deported on February 24, 1942, which coincides with a deportation to Chelmno.