Gender: girl
School:
School #7B
Plugging in 'Tauba Olsztajn' with both names classified as 'exact', Chana Tauba's was the only name that came up, and her birthdate puts her in the right age range for her school and to have signed the album.
Brajna (b. 1933) was likely Tauba's sister, and Rywka (b. 1907), was likely their mother. They all have the same address as well as the same deportation date: March 20, 1942. There were daily transports to Chelmno in March 1942, and it is likely they were on this deportation.