In searching for Nacha's name, two variations of spelling of her last name came up--Alembik and Alenbik. While they had different years of birth, they were only within one year of each other and still within the right birthrange for her to have signed the album.
One of Nacha's profiles said she lived at Franzstrasse (and Francis) and then moved to Sigfriedstrasse on March 2, 1942. Nacha's other profile indicates that she lived at Sigfriedstrasse and Franzstrasse, which allowed me to connect the dots and conclude that they are the same person.
Death records for Nacha Alembik indicate that she died on September 20, 1942, of "Rippenfellerguss," which translates to pleural effusion (which, according to the US National Library of Medicine's website, is a buildup of fluid between the layers of tissue that line the lungs and chest cavity.)
There were two records (like Nacha) for the woman I have determined is Nacha's mother: Estera Alembik/Alenbik (b. 1904). On one record there is a note that says ANG 17.3.42, which could either be a) the date Estera switched addresses between Franzstrasse and Sigfriedstrasse, or b) a deportation date, as there were daily deportations to Chelmno during March 1942.
There were also two records for the girl who I presume to be Nacha's sister, Szajndla Alembik/Alenbik (the two records have different years of birth: 1931 and 1933). I would normally not assume that these records are the same person as they have varying addresses as well, except for the fact that the addresses correspond to Nacha's addresses. Szajndla has the same note as Estera (ANG 17.3.42), and, like with estera, it is unclear if this is a change of address date or a deportation date.
A potential brother, is Szloma Alembik/ Szlame Srulame Alenbik (b. 1939). Like Estera, Nacha, and Szajndla, the addresses on the two differing records also correspond. Also like Estera and Szajndla, the note of ANG 17.3.42 is not clearly indicative of either a deportation or an address change.
There is also a Szulames Alenbik, a girl born in 1939, who could possibly be Szloma/Szulame's twin? The 17.3.42 date is also present on her record.