Gender: girl
I did a search a search for Regina Aronowicz and came up with nothing. Some students did research on her and they believe she was Irena Aranowicz born 28 May 1925 and lived at Zimmer 6 27 and Zimmer 23 2. She also appears as Irena Aronowicz.
The family of Irena Aranowicz/Aronowicz was Estera Aronowicz born 13/12/1898 (mother) Zindel Zygmund Aronowicz born 05/05/1882 9father) and Zofja/Zofia Aronowicz/Aranowicz (Sister) born 18/12/1921. They all lived together at Zimmer 23 Flat 2. There was also Lajb Aronowicz born 05/08/1876 living at the same address.