I believe Franka Zylbersztajn was Franciszka Zlbersztajn born 18/11/1922 and she lived at Rembrandt 9 Flat 7. She also appears as Franciszka Zylbersztajn with the same address and birthdate.
I found the following people living at Rembrandt 9 Flat 7.
1.) Hercyk Zylbersztajn/Zlbersztajn born 20/03/1897.
2.) Cyrla Zylbersztajn/Zlbersztajn born 10/08/1894 and she was deported on12/09/1942.
3.) Boruch Dawid Zylbersztajn/Zlbersztajn born 25/11/1920.
4.) Mojzesze Zylbersztajn/Zlbersztajn born 10/06/1926
5.) Fajwusz Zylbersztajn born 11/04/1920 and she was deported on TR 6.
6.) Fradel Frania Zylbersztajn born 25/08/1895 and she was deported on TR 6.
I found a page of testiony submitted by her brother Beniamin Szlbersztajn for Franka Zylbersztajn/Zlbersztajn and it says that she was born on18/11/1922 and that her father was Herko and her mother was Cesia Binger. There was three other pages submitted by Beniamin for Herko born 20/03/1897 and Cesia and Moshe born 1928 and it states they all died in Auschwitz in 1944 except for Cesia and she died in 1942 in Chelmo.
This tells us who Franciszka's parents and at least one of her siblings were. Also with Cyrla's deportation of September 12, 1942 it confirms with the page of testimony.